Times are shown corrected for daylight savings when in use if
this option is selected. The adjustment dates for daylight
savings time are those used in the United States. All times are
either EST or EDT.
Times use a 24 hour clock. Subtract 12 hours from times greater
than 12:59 to get the "PM" times.
Sunrise and Sunset:
Times for sunrise and sunset are computed
for the point that the sun is 50 minutes of arc below the
horizon (assuming no mountains.) If sunset occurs after
midnight it is shown on the day that it actually sets.
The length of the day is derived by subtracting
the time of rise (rounded off) from the time of set (rounded
off.) This applies to the day that it is actually shown for.
Sunsets that occur on the following day are not used for the
current day calculation.
The change in length of day is derived by subtracting
the day length of the previous day (undisplayed and not
rounded off) from the day length of the current day (also not
change is displayed to the nearest second and is value of the
Times for beginning and ending of civil
twilight are computed for the point that the sun is 6 degrees
below the horizon.
The rise and set azimuths show the angle that the sun rises
and sets with respect to true north.
The maximum elevation is that highest angle that the sun
reaches during the day.
This is the transit time when the sun is due
south (180 degrees) shown to the nearest second.
Moon rise and Moon set:
Time are computes assuming a flat
horizon (no mountains.)
Rise and Set Azimuth:
The rise and set azimuths show the
angle that the moon rises and sets with respect to true
This is the highest angle that the moon
reaches in the sky.
This is the time that the moon is due south (180
Phase shows when the moon is full or new. When full
the fraction .99 is shown. When new the fraction drops to
This is the number of days since last new moon.
When ------ is shown in place of numbers it indicates that
data is missing because the sun or moon remains below the
When ****** is shown in place of numbers it indicates that
data is missing because the sun or moon remains above the
When ...... is shown in place of numbers it indicates that
data is missing because the time of sunset or moonset occurs
on the following day.
When two sunsets or moonsets occur on the same day the second
one is shown on a separate line below the first.