Introduction

Main Input Screen

Body Selector Window

Calendar and Print Options

Sunrise, Sunset, and LAN

Moonrise and Moonset

Accuracy and References

Arc to Time Table

StarPilot Programs

Calendar and Print Options

The display below is the same as the Main Input Window, except that use of the calendar input has been selected. To open the calendar option, click the arrow next to the date. As a default, the program always opens on the present date as interpreted from your computer settings.

To use the calendar, click the date of interest. That will load the date into the input field and close the calendar. To change the month use the arrows at the top of the calendar display. For changing the year it is easier to not use the calendar until you change the year in the main input screen. Then the calendar comes up in that year. The present date according to your computer is always displayed at the bottom of the calendar, regardless of the almanac date you selected.

To print ephemeris results, press Print and enter the time interval to be used for the successive computations along with the number of computations you want (called number of rows) beyond the initial time entered, and press OK. The data are formatted for standard letter size paper. A sample section of the print out is given below.

Note that SD (semi-diameter) applies only to the sun. HP (horizontal parallax) applies only to the moon. The SD of the moon depends on the altitude of the body, which in turn depends on Lat and Lon as well as date and time. If you want SD moon, that can be computed from the Starpath StarPilot programs.

The SD of the sun can be used for measuring an accurate index correction; there are no common uses of SD moon in routine celestial navigation.