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Astronomy Software for the Observer

AstroClock FX


AstroClock FX displays seven clocks all on one screen!

This astronomy clock displays the current local & UTC date & time, a calendar, local & Greenwich sidereal time, and the Julian date. The menus include information for the current sun, moon, eclipses, ephemerides for all the planets, minor planets and comets. It also has three timers that can be run independently.

The algorithms used are based on Jean Meeus book "Astronomical Algorithms." Planet images are generated using the JParsec library - Tomas Alanso Albi.

Requires Java 8
Updated 2020/09/20

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Double Star Database

Double Star Database

This astronomy program displays the current local & UTC date & time, a calendar, local & Greenwich sidereal times, and the Julian day. From the menu items you can access a database of double stars from the WDS catalog and Sixth Catalog of Visual Binary Stars as well as a comprehensive database of the Finest observable doubles gleaned from the most popular observing lists.
There are several useful calculators. And a basic observer's Log to record observations and measures.
Algorithms used are based on Jean Meeus book "Astronomical Algorithms"

*** Important***   If you are updating from a previous version go to
Configure|Update WDS Files

Requires Java 8
Updated 2020/09/12

Saguaro Database 8.1

Saguaro Database

The Saguaro Database is a compilation of data that was begun in an effort to provide a comprehensive observing list for use at the eyepiece of a modest amateur telescope.
The members of the Saguaro Astronomy Club of Phoenix, Arizona, along with the skill of a variety of other people, have provided much of the effort to compile this database.
This program makes it easy to sort and view the database and its individual objects. Rise/Transit/Set times are calculated as well as Stellar Atlas chart numbers.

Requires Java 8
Updated 2020/09/12

Delta-T Chart


The Delta-T chart displays the data for any year from 1973 to the current year. Current data is downloaded from the IERS website from the Configure menu.
Historical charts and data can also be displayed.
Published research papers related to the calculation of Delta-T are in the Documents Folder.

Additional information, links and resources can be found on the internet.

Requires Java 8
Updated 2020/09/12

World Time Zones (Windows)

Time Zones

This program displays the time in all the zones around the world.
Time zones specifically for the U.S can also be displayed.
There is a daylight map and a calendar too.

Distance Calculator

Distance Calculator

The Distance Calculator calculates the distance between two points on Earth. Caclulates the Great Circle, Rhumb line and Straight Line (distance through the Earth)
You can select between U.S. cities, World cities or Observatories.
Or directly input latitude and longitude.

Requires Java 8

UCAC4 ASCII Converter (Windows)


This program converts the binary UCAC4 files to human readable ascii files.
It is advisable that the files from the USNO DVD be copied to your hard drive. The only two directories that need to be copied are u4b (sides 1 & 2) and u4i (side 1) The directory structure should remain the same e.g. c:\u4b c:\u4i
You can copy this program and run it from any directory. Be sure to copy both the UCAC4.exe and u4index.bin to the same directory.
The program itself is self-explanatory. For specific details about the fields see the readme_u4.txt on the USNO DVD.
USNO CCD Astrograph Catalog (UCAC)  web page
Read the readme.txt file enclosed with the zip file.

Astronomers Without Borders