Calculating time based on solar position

In summary, The conversation discusses how to determine the date and time based on given latitude, longitude, solar azimuth, and solar altitude. The time is limited to the period between the summer and winter solstices and there is only one answer per sun position. A picture is provided for motivation and there is a formula for the reverse problem, but getting the forward version may not be as simple. The time is easy to determine as the sun completes a full revolution around the compass each day, but finding the date is more difficult and may require checking a table or calculating for the specific latitude.
  • #1
fyzle
1
0
Hi everyone,

How do I figure out the date and time given latitude, longitude, solar azimuth and solar altitude. Let's say the time is limited to the time of the year starting at the summer solstice and ending at the winter solstice, so that there is only one answer per sun position.

This picture is motivating me: http://www.alternativephotography.com/articles/art108.html

There's a formula for the reverse problem here: http://squ1.org/wiki/Solar_Position_Calculator#Manual

But, it doesn't seem that easy to get the forward version.
 
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  • #2
The time is easy - the sun completes a complete revolution about the compass every day: at midnight it is due north and at noon it is due south.

Date is more difficult and is easiest to find via the altitude at noon, checked against a table or calculated for your latitude.
 

FAQ: Calculating time based on solar position

1. How do you calculate the time based on solar position?

To calculate the time based on solar position, you will need to know the current solar position, which includes the longitude, latitude, and altitude of your location. Then, you can use a formula or online calculator that takes into account the Earth's rotation and the position of the sun to determine the exact time.

2. What is the significance of calculating time based on solar position?

Calculating time based on solar position can be helpful for various purposes, such as navigation, agriculture, and astronomical observations. It can also be used to determine the local time in different parts of the world, as the Earth's rotation and the position of the sun vary in different locations.

3. How accurate is the calculation of time based on solar position?

The accuracy of the calculation depends on the method used and the precision of the input parameters. Generally, it can provide a fairly accurate time, with a margin of error of a few minutes or less.

4. Is there any difference between calculating time based on solar position and using a clock or watch?

Yes, there is a difference between the two. Calculating time based on solar position takes into account the Earth's rotation and the position of the sun, while a clock or watch may not be as precise and can vary based on time zones and daylight saving time.

5. Can we use the calculation of time based on solar position for any location on Earth?

Yes, the calculation can be used for any location on Earth as long as the necessary parameters, such as longitude, latitude, and altitude, are known. However, it may be more accurate for locations closer to the equator due to the Earth's tilt and the changing position of the sun throughout the year.

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