Hi,
This is because the calendar use a shortcut to speed the calculation
when you request a long range of date. Remember I developed most of the
V2 with a 166Mhz Pentium :-)
For rapidly moving object such the Moon, Sun, planets, some asteroid and
comet we need an iterative or interpolative computation to find the real
rise/set time.
This is done in the info box for one object but not in the calendar, or
only for the Moon.
The Sun and Moon rise/set always refer to the upper limb and take
account for the refraction.
In real world there is always a much bigger difference because of
variation in the refraction, obstacle at the horizon, ...
Patrick
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