how to calculate the time of te astronomical noon?

Question

astronomical noon is the midpoint between the sunrise and sunset times... any website that can give u this info, automatically or soemthing?

Answer 1

The easiest way to find astronomical noon, or "local apparent noon" as it's called, is to just measure it! When the Sun is directly south from where you are (if you're in the Northern temperate zone) that's local apparent noon. In the old days, many towns had "noon marks" that would cast a shadow on a particular place when the Sun was directly south.

If you want to compute it instead of observe it, you need to know three things: first is your time zone, compared to Greenwich; second is your longitude; and third is the "equation of time".

Each time zone represents 15° of longitude from Greenwich. Knowing your time zone, you can use this to figure out the "standard meridian" for your time zone. For example, Eastern Time in the US is 5 hours behind Greenwich (or GMT -5 as we say). Each of those hours is 15 degrees of longitude, so the standard meridian for Eastern Time is 5 x 15 = 75 degrees west.

Now compare your actual longitude to the standard meridian for your time zone. If you're exactly on 75 degrees west, that's great: you have no longitude correction to make. If not, count four minutes late for each degree you are west of the standard meridian, or four minutes early for each degree you are east of the standard meridian. This number is your longitude correction.

The final correction you need to make is the "equation of time", which basically tells you how fast or slow the Sun is compared to a clock. It varies throughout the year, but each year is pretty much the same. The computation is difficult, so it's easiest to look it up on a website, like this one:
http://www.sundials.co.uk/equation.htm

So from clock noon, apply your correction for longitude, and your correction for the equation of time, and that will give you the clock time of local apparent noon.

And one more thing: don't forget to use STANDARD time, like we use in the winter, and not daylight savings time. Otherwise, instead of local apparent noon, you'll compute local apparent 1 PM!

Answer 2

Local Noon Calculator

Answer 3

This Site Might Help You.

RE:
how to calculate the time of te astronomical noon?
astronomical noon is the midpoint between the sunrise and sunset times... any website that can give u this info, automatically or soemthing?