Longitude and latitude need to be decimals, not minutes and seconds, so here's a calculator. ° ' "        Positive numbers are for North and East. Negative numbers are for South and West.

Here you have the input form for the Transitor, one of the simpler comparison programs. It accepts two dates and times, along with one location, and calculates the charts for both. It can be used to compare any two dates, regardless of the labels. The only draw back to this program is that it can only be used with a single place. This is exactly what you want for most transits, even if you move to a different part of the world. You can compare two dates from two different locations with the even simpler DayComp program.

The advantage to the Transitor is that it can be set to new dates and times (not locations) without closing it or backing out. It also features fully controllable orbs for both parallels and aspects, and any option can be changed on the fly. If you do extensive work with transits, this program will be your best friend. If you use rectified (also called "corrected," "adjusted," "verified," or "confirmed") birth times, this program will provide you with accurate house cusp aspects. House cusps can't be trusted without rectified birth times, which is probably why they haven't been used widely throughout history.

Although the Progressor was written for rectification, this program (the Transitor!) could also be used to correct birth times. The process of rectification itself is complicated enough to make it necessary that the astrologer still do a lot of work, even with a computerised assistant. This program provides a second method of rectification. Remember that if you actually did find the right birth time, then both methods should agree on it.