This is the Windows version. Mac and Palm OS versions are also available.

You may fill out forms for all the objects you intend to view in a session, then use the forms to keep track of your sucess, or you may observe as you always have, and record your observations during or after your session. After you're done, you can view and print your observing records sorted by date or by object.

There's even a space where you can sketch your observations on the page, or place scans of your sketches after you're done. An "astrophoto" section for each observation lets astrophotographers keep track of their exposures as well.

When you want to use TSOL in the field, simply choose "Nightvision Mode" to switch to a vision-saving red display!

It allows you to connect your computer to one of the following astronomical telescopes:

You can also edit the profile of your local horizon, apply filters to the objects and create your own lists of topics of interest.

The full product offers:

The program computes the data of the object positions using algorithms programmed by the author. For the calculation of the true obliquity of the ecliptic and of the nutation effect the periodical elements from the «1980 IAU Theory of Nutation» are used. The equatorial coordinates of the objects are those from the J2000.0 and were obtained from the NGC 2000.0 (Sky Publishing, ed. Sinnott 1988). The apparent coordinates at time of observation are calculated taking into account the precession effect and corrections in R.A and Dec. due to nutation and annual aberration valid for the coordinates based on the FK5 system. The annual parallax effect is not taken into account since the distance of the objects to the solar system is too large.

Alt/Az positions are computed.

Allows the user to record his own observations by providing a practical input system.