Accuracy
It is one of the oldest calendars in the world as well as the most accurate solar calendar in use today. Since the calendar uses astronomical calculation for determining the vernal equinox, it has no intrinsic error, but this makes it an observation based calendar. According to a proposal made by Ahmad Birashk, a complex mathematical pattern can be used to make the calendar a purely mathematical one without the need for astronomical observation. This proposed calendar has a great grand cycle of 2,820 years in which 2,137 years are normal years of 365 days and 683 years are leaps of 366 days, averaging a day-length of 365.24219852, over the 2,820 years of the great grand cycle. This average is just 0.00000026 day shorter than the actual solar year of 365.24219878 days, making an accumulated error of just one day over 3.8 million years or approximately 0.022 of a second annually.
Read more about this topic: Iranian Calendars
Famous quotes containing the word accuracy:
“As for farming, I am convinced that my genius dates from an older era than the agricultural. I would at least strike my spade into the earth with such careless freedom but accuracy as the woodpecker his bill into a tree.”
—Henry David Thoreau (1817–1862)
“In everything from athletic ability to popularity to looks, brains, and clothes, children rank themselves against others. At this age [7 and 8], children can tell you with amazing accuracy who has the coolest clothes, who tells the biggest lies, who is the best reader, who runs the fastest, and who is the most popular boy in the third grade.”
—Stanley I. Greenspan (20th century)
“Such is the never-failing beauty and accuracy of language, the most perfect art in the world; the chisel of a thousand years retouches it.”
—Henry David Thoreau (1817–1862)