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.


Sun

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.

Day length:

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.

Change:

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 true change.

Civil Twilight:

Times for beginning and ending of civil twilight are computed for the point that the sun is 6 degrees below the horizon.

Azimuth

The rise and set azimuths show the angle that the sun rises and sets with respect to true north.

Max Elev

The maximum elevation is that highest angle that the sun reaches during the day.

Solar Noon:

This is the transit time when the sun is due south (180 degrees) shown to the nearest second.


Moon

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 north.

Maximum elevation.

This is the highest angle that the moon reaches in the sky.

Transit.

This is the time that the moon is due south (180 degrees.)

Phase.

Phase shows when the moon is full or new. When full the fraction .99 is shown. When new the fraction drops to .00.

Age.

This is the number of days since last new moon.

Special symbols.

When ------ is shown in place of numbers it indicates that data is missing because the sun or moon remains below the horizon.

When ****** is shown in place of numbers it indicates that data is missing because the sun or moon remains above the horizon.

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.