the revolution of earth around the sun
A year is based on the time it takes Earth to do one revolution or orbit of the sun.
the revolution of earth around the sun
Calanders are based on the revolution of the earth around the sun.
Based upon is written more often.
Tropical year from one spring to the next to govern seasons in 365.2422 days
It's all up to you. [See related question] A solar year is based on the Earths orbit around the Sun, whereas a lunar year is based on the cycle of the Moon. Mainly used now in Islamic calender's.
the length of earths year is 365 days, tho its not really hahaha
Based on temperature differences.
how does earths distance from the sun change throughout the year
a star fish is based upon it
It is based on earths water
Based on temperature differences.