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Mapping the Earth

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Mapping the Earth - Page 2 Empty Re: Mapping the Earth

Post by leotruther Sun Jul 18, 2021 12:52 am

Waiting for instructions on how to calculate my "BDH" position.

I am in Rio, Brazil

GPS: Latitude -22.9201 / Longitude -43.3307

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Mapping the Earth - Page 2 Empty Re: Mapping the Earth

Post by bdhfe Sun Jul 18, 2021 2:03 am

Thanks leotruther!!
I will put out the steps within a day or so.
BDH

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Mapping the Earth - Page 2 Empty Re: Mapping the Earth

Post by bdhfe Tue Jul 20, 2021 6:16 am

The Process of calculating Latitude and Longitude on a Flat Earth occurs by performing a number of steps over two days.
Note: These steps will be supplemented with photos and illustrations as the particular step may require.

Assumptions:
1.  The Sun rotates around the center point of the Earth -- the North Pole -- once every 24 hours.
2.  The Sun is at its most northern point on June 21st -- at 23.44 degrees North latitude
3.  The Sun is at its most southern  point on December 21st -- at 23.44 degrees South latitude
4.  The Sun is at the Equator on March 21 and September 21 -- 0 degrees latitude
5.  The Earth is Flat.


Day One
1.  Find a level area or make one.  The shadow you will be employing will be distorted on a slanted surface.
I used a table and covered it with a sheet of card board making sure the table was perfectly level.

Mapping the Earth - Page 2 Win_2010

2.  Set a post perpendicular (P) to the level surface you are using.
Mapping the Earth - Page 2 Win_2013

Find True North
3.  On day One, being a sunny day of course, start tracking the shadow of the post as it makes its way across the level surface (S) you have set up. (in my case the cardboard on the level table).  Starting about 11:00AM local time begin marking, with pen or pencil, the spot on the surface where the top of the post shadow ends.  Continue marking the surface where the top of the shadow ends every 10-20 minutes or so until about 1:30PM local time.  The marks made on the surface (S) will result in the shape of an arc (A).
Mapping the Earth - Page 2 Win_2015

4.  Connect the dots on the Surface (S) by connecting them with a smooth curved line.
Mapping the Earth - Page 2 Win_2017

5.  Find the shortest distance from the bottom of the Post (P) to the arc (A).  Place a mark N on arc (A) at the spot closest to the post (P).
Mapping the Earth - Page 2 Win_2019

6.  Draw a line from the base of Post (P) to the point N.  This line represents True North .  We will call the line TN.
Mapping the Earth - Page 2 Win_2021

Why is this?  When the Sun is at its highest point in the sky at your location -- the zenith, the shadows will be the smallest.

Find Latitude

coming next time

BDH

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Mapping the Earth - Page 2 Empty Re: Mapping the Earth

Post by bdhfe Thu Jul 22, 2021 4:29 am

Find Latitude

Continuing with Day One, we can now calculate Latitude based on the
1. Height of the Post,
2. the Length of the line TN, as well as
3. a Tangent table or Tangent calculator, and
4. the current position of the Sun latitude-wise on Day One.

Note: In an earlier post, I calculated the amount of change in degrees per day of the Sun's position between the solstices and equinoxes based on 23.5 degrees instead of 23.44 degrees.
I will now post a more correct calculation of change in degrees per day here:

Time between June 24 and September 21 = 89 days = 128,160 minutes.
23.44 degrees North to 0 degrees (Equator)

Sun moves South to Equator at 23.44 degrees / 89 days = .263 degrees/day

Time between September 21 and December 21 = 91 days  = 131,040 minutes.
0 degrees (Equator) to 23.44 degrees South

Sun moves South from equator at 23.44 degrees / 91 days = .258 degrees/day


Time between December 24 and March 21 = 87 days = 125,280 minutes.
23.44 degrees South to 0 degrees (Equator)

Sun moves North to Equator at 23.44 degrees / 87 days = .27 degrees/day

Time between March 21 and June 21 = 92 days =  132,480 minutes.
0 degrees (Equator) to 23.44 degrees North

Sun moves North from Equator to 23.44 degrees at 23.44 / 92 days = .255 degrees/day

--------------------

Tangents

To know the current latitude of our location, we will calculate the angle to the Sun at its Zenith by taking into account the current latitude of the Sun on this day, and either adding or subtracting to or from it to get the Latitude at our location.

First, here is the definition of Tangent:
Mapping the Earth - Page 2 Tangen12

To be continued.....

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Mapping the Earth - Page 2 Empty Re: Mapping the Earth

Post by bdhfe Thu Jul 22, 2021 6:18 am

Find Latitude (cont.)

To find the angle Mapping the Earth - Page 2 Theta10
divide the Height of the Post by the length of line TN to get Tan Mapping the Earth - Page 2 Theta10

To get the value of the angle Mapping the Earth - Page 2 Theta10
Use Arctan (Height / Length of TN) to get Mapping the Earth - Page 2 Theta10.

Arctan calculator here:  Arctan Calculator

--
For example, say Height of Post P = 9 and Length of line TN = 4.5.  

9 divided by 4.5 = 2

Arctan of 2 = 63.43494882 degrees

Thus Mapping the Earth - Page 2 Theta10 = 63.43494882 degrees

--

Next, calculate the position of the Sun on Day One in terms of its Latitude.

For example, the date of the exercise was on July 18th, when the sun has started its trip South from the Tropic of Cancer.
Referring to the table in the previous post, we have:

Time between June 24 and September 21 = 89 days = 128,160 minutes.
23.44 degrees North to 0 degrees (Equator)

Sun moves South to Equator at 23.44 degrees / 89 days = .263 degrees/day

From June 24 to July 18 is 24 days.

24 days times .263 degrees/day = 6.312 degrees.
Subtract 6.312 degrees from 23.44 degrees = 17.13 degrees North Latitude

The Sun on July 18th is at 17.13 degrees North Latitude.

To get the Latitude of the location in my example where Mapping the Earth - Page 2 Theta10 = 63.43494882 degrees,

Subtract 17.13 degrees from 63.43494882 degrees to get 46.3 degrees North Latitude


We will find Longitude on Day Two.

BDH

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Mapping the Earth - Page 2 Empty Re: Mapping the Earth

Post by bdhfe Thu Jul 22, 2021 6:38 am

Note on Latitude calculations North of the Equator and South of the Equator.

In the example above, when the Sun is North of the Equator, and my location is North of the Equator.
The Latitude of the Sun will be subtracted from the angle Mapping the Earth - Page 2 Theta10

If the Sun is North of the Equator and the location is South of the Equator, the Latitude of the Sun will be added to the angle Mapping the Earth - Page 2 Theta10

If the Sun and the location are both South of the Equator, the Latitude of the Sun will be Subtracted from Mapping the Earth - Page 2 Theta10

Summarizing, one can say that if both Location and Sun are on the same side of the Equator, one Subtracts,
and if Location and Sun are on opposite sides of the Equator, one Adds.


BDH

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Mapping the Earth - Page 2 Empty Re: Mapping the Earth

Post by bdhfe Fri Jul 23, 2021 6:05 am

Day Two

Find Longitude

To find the Longitude at one's location two items are required:

a.  The shadow of the Post (P) falling directly on the line TN (marking the Sun's zenith) and
b.  The current local  time (to the second) along with the time in London England (UTC).

Note:  UTC will be used at the base time for our Longitudes rather than adopting something completely new.

1.  The following photos are taken as the Sun approaches the line TN (its Zenith)

Mapping the Earth - Page 2 Imgp2910
Mapping the Earth - Page 2 Imgp2912
Mapping the Earth - Page 2 Imgp2913

The time is recorded as the shadow falls completely over line TN
Mapping the Earth - Page 2 Imgp2914

The time taken locally is compared to the time in London England UTC or GMT

In my example, the Sun crossed the line TN at 12:53:29 pm local time.
The time in London England was 19:53:29 pm

The difference is 7 hours. **

** Since there are parts of the world that use Daylight Savings Time and some do not, let us perform the time difference based on Gleason's map, which map provides a consistent time difference between your general location and Greenwich Mean Time.

We know that the Sun moves once around the Earth, that is 360 degrees in 24 hours.  This equates to 15 degrees per hour.

Establishing a baseline in degrees to my 12 o'clock hour, it comes to 15 degrees times 7 = 105 degrees.

So I am at some longitude greater than 105 degrees as the Sun passed the Zenith at my location at 12:53:29.

To get to my longitude then, I add the 53 minutes and 29 seconds in degrees to the 105.

53 minutes 29 seconds in decimal = 0° 53' 29" = 0° + 53'/60 + 29"/3600 = 0.8913889
Decimal converter here:  Convert Degrees to Decimals

0.8913889 of one hour (or 15 degrees) = 0.8913889° times 15 = 13.37 degrees.

Thus, the Longitude at my location comes to:  105 plus 13.37 = 118.37 degrees W Longitude.


I will follow up in my next post with the simplified version of the process of finding Latitude and Longitude locally.

BDH

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Mapping the Earth - Page 2 Empty Re: Mapping the Earth

Post by bdhfe Sun Jul 25, 2021 1:37 am

Reviewing the previous section on Finding Longitude,  the question has arisen regarding the Sun coming back to the local meridian at the exact same time the following day.
If the Sun does cross the local meridian (the True North line) at the same time every day, then no further discussion is required.
However, if the Sun does not cross the local meridian at the exact same time the next day, then we will have to discuss the Analemma and the Equation of Time when arriving at the more exact Longitude reading for our locality.

Mapping the Earth - Page 2 Analem10

I believe I have posted the Equation of Time in an earlier post and then soon dismissed it.  Not so fast.  

This question has come up due to my further testing with the Latitude and Longitude derivations.  I have found that my Latitude calcs for the Sun are matching nicely.  However, the Longitude calculation has failed to provide the precision I would like to see.  
One of two things may have occurred to upset the Longitude calc.  My setup was moved slightly in the past few days, OR  the Analemma needs to be brought into the calculation to give me the precision required for Longitude.

If it is the Analemma, then a discussion of the Equation of Time may be needed.  

Mapping the Earth - Page 2 310px-10

BDH


Last edited by bdhfe on Sun Jul 25, 2021 1:41 am; edited 1 time in total (Reason for editing : Addition of pics)

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Post by RedorBlue Sun Jul 25, 2021 1:08 pm

BDH - your observations are good . You are seeing and charting the change of sun position as it travels around the plane and between the Tropics.  The Analemma photo is proof that it is the sun that orbits and moves nearer or farther , higher/lower as the seasons progress.

The heliocentric model cannot account for this observed motion of the sun .

The equation of time attempts to explain this with math trickery . Actual observed sun position is mapped onto a graph and matched with the imaginary (theoretical) position of where it should be according to the heliocentric model . It's nonsense.

The sun does not move at a constant 15 degrees per hour so you might be able to adjust your calculations to factor this in . The amount of change of velocity will depend on your place of observation. Sounds complicated. Hope you can do it.

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Mapping the Earth - Page 2 Empty Re: Mapping the Earth

Post by bdhfe Sun Jul 25, 2021 9:33 pm

Hi RedorBlue,
Yes!  The Analemma provides the proof that the Sun is moving between the Tropics -- North to the Tropic of Cancer (June 21) and South to the Tropic of Capricorn (December 21).
Mapping the Earth - Page 2 Analem11

And I have calculated a table that charts this motion.  Thus, half the motion of the Analemma is explained and measured.

However, the East-West motion of the Sun as shown in the Analemma is the question.
Mapping the Earth - Page 2 Analem15


This deviation East and West has an affect on the drawing of True North on the surface of my setup.  The arc formed each day will vary and so will change the point on the arc where it is the shortest distance to the post (P).  The shortest point will swing back and forth like the Analemma does.

Going forward, two things have to be established:
1.  Still using the Sun, the correct meridian indicating True North will have to be determined by choosing a particular date that works for this.
2.  What is the degree of deviation based on a given date for calculating True North?  That is, how many degrees do we use for any date on the calendar?

For a solution to #1:
From the following illustration, the Solstices are being used as the True North indicator on the Analemma.
Mapping the Earth - Page 2 Analem10

Marking True North with no deviation will be  set to June  21 and December 21.
The test will be marking the shortest distance on the arc to the post on June 21st and then doing so on December 21st.  If these line up, we have our True North line.

Next, how to determine degree of deviation on any given date in the calendar so that one does not have to wait until the Solstice to get the True reading of North?

This brings up the question of the Equation of Time and its possible usage here.  Is there a relationship between the Equation of Time and the Analemma?

See the following illustration that makes such a relationship:
Mapping the Earth - Page 2 Analem17

So, can we use the minutes deviation in the Equation of Time  to get the offset for determining  True North on any given day of the year?

The answer will be in the testing, which I shall perform with the setup I have in place.
I will provide the calculation next.

BDH

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Mapping the Earth - Page 2 Empty Re: Mapping the Earth

Post by bdhfe Yesterday at 3:11 am

Another illustration of the Analemma with minute marker deviations associated with every 5 days in the year.

Mapping the Earth - Page 2 Analem19

It would appear that December 25th and June 15th are the golden  dates for no deviation off the local meridian.

BDH


Last edited by bdhfe on Tue Jul 27, 2021 6:06 am; edited 1 time in total

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Post by bdhfe Yesterday at 4:37 pm

Further note on the illustrated Analemma in previous post:

The compressed scale of the shape of the Analemma indicates a skewing of the Sun's Declination values to fit the globe model.  Testing via real world experience shows a marked difference in the values of the Sun's Declination as compared to the chart in the previous post.
Likewise, note the difference in shape between the Analemma illustration and the photographic evidence.  The illustration is a fat exaggeration of the real Analemma evidenced by photographs.

As such, the illustrations showing the numbers of the Sun's declination indicate that the values are coming from somewhere else, as they do not fit Real World data.

Summarizing, one can use the Deviation values on the Analemma chart but dismiss the Sun's Declination values.  A more representative chart can be constructed which will more perfectly fit what we see in reality.  
Like this real world analemmatic sundial !!
Mapping the Earth - Page 2 Cadran10

BDH

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Post by bdhfe Today at 6:05 am

Further research is indicating the following:
-- The Analemma is accurate both for the North-South procession of the Sun and the East-West deviation as the Sun speeds up and slows down throughout the year.
-- As such, I am adjusting my calculations to match those of the Analemma as regards North-South and East-West.
Yes, this is contradicting what I stated earlier about dismissing the Sun's Declination values in the Analemma table. But I can see now that the North-South procession of the Sun is not a constant linear procession but in fact forms the curved path one sees in the Analemma.
-- Consequently, the known data from the Analemma will be used as the measuring base for our calculations of Latitude and Longitude.

How is Latitude affected by using the Analemma?
The calculation for Latitude will utilize the Declination of the Sun found in the Analemma tables.
This will vary to some degree from the table I had constructed earlier.

How will Longitude by affected by using the Analemma?
The East-West deviations found in the Analemma table will be incorporated in the calculation of Longitude as well.

How about True North?
True North, being the most important consideration in calculating Latitude and Longitude, does have 4 dates on the Analemma that show NO deviation from the local Meridian -- April 17, September 2, December 25, and June 15.
That is, on those dates, when the Sun reaches the Zenith of the local meridian, its shadow will point True North with no Deviation.  Of course we can get True North on any date using the deviations provided in the Analemma table.

Going forward then, we will use the Analemma table for calculating local Latitude and Longitude as the Analemma is found all around the world and as such is consistent for our use in helping map out the flat Earth.
Mapping the Earth - Page 2 Analem19

Analemma Chart with Deviation values
Mapping the Earth - Page 2 Anatab10


BDH

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Post by RedorBlue Today at 11:21 am

You can check true N against the pole star if you can see it - if it aligns with sun position on those days you mention then that's good .

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