Units of Time Based on Astronomical Motions and Objects Day: New: Time required for the earth to complete one ro Week: Based on 7 celestial bodies observable to ancients, Sun Moon, and 5 planets: Mercury, Venus, Mars, Jupiter, and Saturn. Month: Based on time for Moon to complete one set of pha Year: New: Time required for Earth to complete one orbit around the Sun. 1 year = 365.24 days The calendar year usually has 365 days. To account for the .24 days, once every four years there are 366 days, with the extra day added to the month of February.This is called a Leap Year A Leap Year is any year exactly divisible by 4 and/or any century year exactly divisible by 400. Old: Time between two consecutive sunrises Old: Time for one cycle of the seasons
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Units of Time Based on Astronomical Motions and Objects Day: New: Time required for the earth to complete one rotation. Week: Based on 7 celestial bodies.
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Units of Time Based on Astronomical Motions and Objects
Day:New: Time required for the earth to complete one rotation.
Week: Based on 7 celestial bodies observable to ancients, Sun Moon, and 5 planets: Mercury, Venus, Mars, Jupiter, and Saturn.
Month: Based on time for Moon to complete one set of phases.
Year: New: Time required for Earth to complete one orbit around the Sun. 1 year = 365.24 days
The calendar year usually has 365 days. To account for the .24 days, once every four years there are 366 days, with the extra day added to the month of February.This is called a Leap Year
A Leap Year is any year exactly divisible by 4 and/or any century year exactly divisible by 400.
Old: Time between two consecutive sunrises
Old: Time for one cycle of the seasons
12 Noon Local Solar Time
Your Meridian
Sun rises in the eastand moves westward
Post Meridian, PMAnte Meridian, AM
Local Solar Time, LST
Your Meridian
One Solar Day
. . .
Time Zones•Differ by One Hour
•24 Time Zones
•Based on Longitude
•15° of Longitude in width
•Time equal to LST at central meridian of time zone