The time for the earth to make one revolution around the sun, measured between two vernal equinoxes.
Period of time for the ecliptic longitude of the Sun to increase 360°
1
The flood lasts twelve months and ten days, i.e., exactly a solar year.
2
The Egyptians were the only people in the Old World to frame a solar year.
3
The cycle in which the Earth travels around the sun is called the solar year.
4
The length of the solar year first accurately determined by Dionysius, in the astronomical canon.
5
Distant periods they calculated by the solar year, but for short intervals they reckoned by lunations.
1
It's not a perfect system: The Gregorian year is 27 seconds longer than the astronomical year.
2
The complexities of the calendar allow Ramadan to occur at any time of the astronomical year.
1
And now, by a variety of indications, it was manifest that the winter of the tropical year was at hand.
2
It also approximates a tropical year, the time it takes for the Earth to complete a full orbit around the sun.
3
It was now the spring of the tropical year: the deciduous trees were renewing their verdure, and were covered with young shoots, and bursting leaf-buds.