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What is the difference between local time and solar time?
What is solar time based on?
What is mean solar time?
What is apparent solar time?
Why does the length of a solar day vary during a year?
What is 12 noon local solar time?
Local Mean Time (LMT) is a type of solar time, a timekeeping method using the Sun's movements across the sky. It is based on the average length of a solar day. Sundials show true solar time.
Solar time is a calculation of the passage of time based on the position of the Sun in the sky. The fundamental unit of solar time is the day, based on the synodic rotation period.
Local mean time (LMT) is a form of solar time that corrects the variations of local apparent time, forming a uniform time scale at a specific longitude.
Apparent Solar Time (AST), is the time the Sun shows in the day. We can make a sundial to tell this. Mean Solar Time (MST) is the time on our watches that humans have invented as Sun time is an unreliable way to tell the time for society.
Twelve noon local solar time (LST) is defined as when the sun is highest in the sky. Local time (LT) usually varies from LST because of the eccentricity of the Earth's orbit, and because of human adjustments such as time zones and daylight saving.
Noon is at 12 o'clock. But what about solar noon? What and when is it and what does your local longitude have to do with it? Is it at the same time every day?
The difference between mean and apparent solar time is known as the equation of time. This is usually expressed as a correction, never exceeding 16 minutes, that is added to or subtracted from apparent solar time to determine mean solar time.
