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How to determine lat and long from AZ/EL?
Hi,
Does anyone know what information is needed to determine a latitude/longitude based on Orbital Mechanics? Using the Sun as my base object in the sky, Azimuth - 80 .24512° Elevation - 16.42940° Date/Time - 5 / 10 / 1863 @ 15:15.00 Viewed from : N 38 51.608 W 77 27.859 How can I determine a second latitude/longitude on earth? Thanks for any help / ideas. Mary |
#2
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"MaryMiniuk" wrote in message
... Hi, Does anyone know what information is needed to determine a latitude/longitude based on Orbital Mechanics? Using the Sun as my base object in the sky, Azimuth - 80 .24512° Elevation - 16.42940° Date/Time - 5 / 10 / 1863 @ 15:15.00 Viewed from : N 38 51.608 W 77 27.859 How can I determine a second latitude/longitude on earth? Thanks for any help / ideas. It's not clear what it is you're looking for. What is "a second latitude/longitude"? Are you looking for the sub solar point? |
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It was confusing, because I was confused! Thanks for responding. Now that I am awake, I can be a little clearer. It is my understanding that you can determine a latitude, and longitude based on the Azimuth and Elevation of the sun, at a specific time and date. So, if it was May 10, 1863, at 3:15 PM EST, what latitude and longitude would I be at if I saw the sun at an Azimuth of 80 .24512° and an Elevation of 16.42940°. How can I figure this out? Thanks Mary On Fri, 23 Jan 2004 09:46:30 -0500, "Greg Neill" wrote: "MaryMiniuk" wrote in message .. . Hi, Does anyone know what information is needed to determine a latitude/longitude based on Orbital Mechanics? Using the Sun as my base object in the sky, Azimuth - 80 .24512° Elevation - 16.42940° Date/Time - 5 / 10 / 1863 @ 15:15.00 Viewed from : N 38 51.608 W 77 27.859 How can I determine a second latitude/longitude on earth? Thanks for any help / ideas. It's not clear what it is you're looking for. What is "a second latitude/longitude"? Are you looking for the sub solar point? |
#4
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"MaryMiniuk" wrote in message
... It was confusing, because I was confused! Thanks for responding. Now that I am awake, I can be a little clearer. It is my understanding that you can determine a latitude, and longitude based on the Azimuth and Elevation of the sun, at a specific time and date. So, if it was May 10, 1863, at 3:15 PM EST, what latitude and longitude would I be at if I saw the sun at an Azimuth of 80 .24512° and an Elevation of 16.42940°. How can I figure this out? If you know the time accurately, you can use an orbital theory to fix the actual location of the Sun and Earth at that time, along with the orientation of the Earth due to rotation (sidereal time). This will fix the sub-solar point, that is, where on the Earth's surface the Sun is directly overhead. After that it's just spherical trigonometry to determine where you would need to be to see the Sun at the location you measured. You can find utilities and programs on the net to calculate the Sun's position for any given time, and the sidereal time from standard time, etc. |
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