This is a refined version of the first astrological calculator I've written. It has been modified repeatedly to include more useful information and exclude less useful information, and to make the entire process more efficient. There is still some intentional redundancy left for the sake of printing. The first page is a standard, computer-filled zodiac circle. The second page is a breakdown of all measured positions by house. On the third page and after, two tables of information are given for each of 16 points: The Sun and Moon, the planets, the galactic centre, the star Arcturus, the lunar nodes, the lunar apogee (Dark Moon Lilith), and the lunar perigee.

The Progressor is a program that accepts a location, date and time for "birth" and a date for a future event. The "birth" time is assumed to be natal, but can be nearly anything. It will calculate the progressed chart from the future date provided. Note that the charts displayed are natal, in green, and progressed (day-for-a-year), in blue. This program doesn't deal with transits or anything as it was or will be on the future date. It is specially designed to compare natal charts to progressed charts, including an overwhelming aspect table.

This program compares and displays two dates through transits; i.e. simply sticking two charts on top of one another and seeing where things line up. It also provides extensive and controllable natal-to-transit aspects and parallels. This program will be a huge help to those who work with transits commonly.

An uncommon purpose, this program calculates a progressed date from the natal information provided that corresponds to the future date. That chart is shown in green and the future date, in blue, is treated as a transit comparison. This means that the aspects and parallels given here are calculated as progressed-to-transit, with no pure natal information at all.

This program reports parallels and longitudinal aspects between two dates, times, and places. Parallels and aspects have separate, adjustable orbs. There are 25 aspects in the list, all of which can turn up with a small enough orb. The usual 14 points are measured plus the 12 house cusps from both days. This gives a total of 676 potential aspects!

This aspect calculator gives you natural aspects. Natural aspects are the number of times you must divide a circle to get the distance between two planets. Conjunctions and oppositions are 2. Trines are 3. Squares are 4. Quintiles are 6. Sextiles are 6. Semisquares are 8. Biquintiles are 10. Semisextiles are 12. These are essentially the numerological basis for the aspects. Read the Math column.

This one, if not unique, is certainly simple and helpful. It provides a solar barycentric (not heliocentric, but close) chart for any time and date given. This lets you see what the Sun is experiencing from its own perspective. It also makes obvious some alignments that would go unnoticed otherwise.

I don't know of any other programs that do what this one does. It calculates, based on distance in AU and known mass, the gravitational pull exerted on the Earth in Newtons. It also shows you a geocentric chart of where everything is and provides as second page that labels a map with each planet at its closest point on Earth's surface. If nothing else, it should prove an interesting addition to some other project.