Sun was an easy and accessible source for calculating time, then why do you think sundial failed to be used to calculate time . List any two drawbacks (
Answers
Answer:
Although the Sundial is very simple to make and to use, it also has many disadvantages. A Sundial is no longer accurate after a month. This is because the obliquity of Earth causes the 'path' of the Sun to change over the months. The same Sundial cannot be used in two different places.
Explanation:
The equation of time describes the discrepancy between two kinds of solar time. The word equation is used in the medieval sense of "reconcile a difference". The two times that differ are the apparent solar time, which directly tracks the diurnal motion of the Sun, and mean solar time, which tracks a theoretical mean Sun with uniform motion. Apparent solar time can be obtained by measurement of the current position (hour angle) of the Sun, as indicated (with limited accuracy) by a sundial. Mean solar time, for the same place, would be the time indicated by a steady clock set so that over the year its differences from apparent solar time would have a mean of zero.[1]
The equation of time is the east or west component of the analemma, a curve representing the angular offset of the Sun from its mean position on the celestial sphere as viewed from Earth. The equation of time values for each day of the year, compiled by astronomical observatories, were widely listed in almanacs and ephemerides.[2][3]:14
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