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## What is the calculation for longitude?

I recently have been doing a calculation for a new GPS system but can not crack Longitudes decreasing properties as Latitude Increases...

Basically as Latitude increases to 90 Longitude is 0 and as it hits 0 Longitude hits 100%..

Any conclusions? I am stuck and need help so anything will help stimulate the thought...

Latitude is working... Longitude is not so much...

HERE IS THE NEWEST LINKS:

https://docs.google.com/spreadsheet/ccc?key=0AgX5y-75MtwCdEgwZUlXQUZKVGhVQklLajg2T1FTcHc

http://www.gorissen.info/Pierre/maps/googleMapLocation.php

## Comment deleted

## Joshua Sisk

## Fritzie - 200+

Still, this calculation is algorithmic, and I think the best advice would come from the same sort of site that helps people with homework in this area.

## John Smith 30+

## Joshua Sisk

The prime meridan Idea Is not going to work on this end because we are wanting a non specific calculation system that while be defined by the observer not pre diagnosed regulations...

Google I have no clue but I am returning Excellent Latitudes but Longitude Is all over the map If I can pin down why then I can solve it but I first have to Iron out my logic...

I JUST DON:T KNOW YET...

## John Smith 30+

It should be exactly the same for longitude and lattitude, just rotated 90 degrees (if you rotate clockwise north becomes aest and south becomes west). You need trig functions for the actual math but you probably know that laready since you got the lattitude function working.

## Joshua Sisk

## Mark Kurtz 20+

## Joshua Sisk

Latitude and longitude are the restrictions to times equation but longitude is restricted by times calculation literally....

I can calculate latitude from the equator because it is a simple distance from 0, so observer is how far from 0?

Now how do I ask the same question for longitude in math equivalant terms?

The steps of the excel are

AVERAGING

CIRCUMFERENCE

PYTHAGOREAN THEOREM (Latitudinal step of calculation...)

## Fritzie - 200+

For example, if you do an internet search for formula for longitude, Pearson has a formula sheet you can download, doesn't it, and steps using Excel?

And here is a link to a group of tutors who answer questions like yours online:

http://www.transtutors.com/homework-help/earth-science/geophysics/longitude/

## Joshua Sisk

Since longitude handles four hemispheres it required two sign changes one for Southeast Northwest and NORTHEAST or SOUTHWEST...

But I had latitude at a right angle from the equator to the axis of the observer latitude then from the axis the longitude spreads out to form a new diameter at the observed latitude.

Again I not sure if I have the calculations right but the process of what is happening is locked down...

Select FILE/DOWNLOAD AS

https://docs.google.com/spreadsheet/ccc?key=0AgX5y-75MtwCdDJDZjhVM1pZUmZZelM0OUE0emdsR0E

The first green is latitude the the other Items stacked are Longitude

To use with open office you must first rename and save document...

Here are the two videos that tested the equation...

http://www.youtube.com/watch?v=ARhTMMjzVtg

http://www.youtube.com/watch?v=fIcZv55wF2Y

I do thank everyone in the videos they do not plea for money at this point but I do need help testing the equation so If others could test it out and then tell me what is happening I will not beable to do extensive testing for a week and a half...

The circle has a left and right and can be above or below the equator... This handles the equations needed to calculate Longitude... Since Latitude is always positive because Pythagorean Theorem is required to calculate; I know I am correct in my thought process it is now Ironing out the equations needed.

## Joshua Sisk

## Fritzie - 200+

http://www.nationalatlas.gov/articles/mapping/a_latlong.html

## Joshua Sisk

## Joshua Sisk

## Joshua Sisk

KEEP THE STIMULATION OF ANSWERS COMING WE WILL CRACK THIS BEFORE THE END OF THE REstricted time...