High noon, also known as solar noon, is the moment during the day when the sun reaches its highest point in the sky. At high noon, the sun is directly overhead at the observer's location and casts no shadows.
The exact time of high noon depends on the observer's location and the time of year, as the position of the sun in the sky changes throughout the day and the year. However, you can calculate the time of high noon using the following steps:
Determine your location's longitude and time zone.
Calculate your location's solar noon by adding or subtracting the time zone offset from 12:00 pm local standard time. For example, if your time zone is GMT-5 and it is currently on standard time, solar noon would be at 12:00 pm - 5 hours = 7:00 am.
Adjust for daylight saving time, if applicable. If your location observes daylight saving time, add one hour to the solar noon time during the period when daylight saving time is in effect.
Make small adjustments for the time zone border, if applicable. If you are located near a time zone border, the solar noon time may vary by a few minutes depending on your exact location.
Keep in mind that the above calculation provides an approximate time of high noon as it assumes a perfectly flat and level Earth. In reality, the position of the sun in the sky can be affected by factors such as elevation and atmospheric refraction.