What you find above is the input form for the Progressor, a program that displays and compares natal to progressed charts. The first date is assumed to be a birthday, although it can be used for many things. You'll notice that a full date and time are required for the first day, but not for the second (future) day. The future date is the one that will be progressively compared to the natal chart. The program will translate portions of a year to portions of a day by (highly accurate) ratio and then display the natal chart (green), overlaid with the day-for-a-year progressed chart (blue) which corresponds to that day. This means that if the future date is 30 years ahead of the natal, then the chart that will be compared will be 30 days after birth.
This program doesn't handle transits; nor does it give aspects of each date to themselves. The giant aspect table at the bottom provides natal-to-progressed aspects only and does so with a fully controllable orb. The same goes for the parallels. The progressed date and time which corresponds to the chart shown will be underlined in blue at the top right, while the future date being examined is blue without a line. This program can also be used for rectification if you know what to do.
The box at the top left, labelled "Adjust Seconds" will accept a positive or negative integer. Remember that whenever the program is rehashed (click either one of the "Rehash" buttons or hit enter with a cursor inside one of the boxes), the "Adjust Seconds" box will be processed again too. In effect, you should set "Adjust Seconds" to 0 to change some other option without incrementing natal time. If you just want to change on the fly while browsing, then there's no problem.
The box for changing the future date you initially entered is at the top right. The box labelled "Method," at the top left of the aspect table, determines how you calculate distance between the planets. The options are GeoDist, geometric distance, which treats the ecliptic like an x axis and the meridian like a y axis to find the two dimensional distance between the two points in the sky, and LongDiff, longitudinal distance, which counts only the x axis. The longitudinal method seems to produce more sensable aspects under the razor scrutiny of tiny orbs.
When you examine time scales as small as ±10 seconds with aspect orbs as small as 0.0005, you can see how very precise a functional birth time must be in order to coincide with a future date accurately. This tool (the Progressor!) allows you to adjust birth times to precisely coincide, through aspects and parallels, with future dates. Natally, the expected window is the first breath time to as much as four and a half hours prior, so most of the time the "Adjust Seconds" integer should be negative. It is common for most astrologically functional birth times to be close to the first breath time and just a little before.
In this way, write down the birth times you've adjusted from three, four, or five future dates. The more you have, the better your case for confirmation. Once you've gotten a birth time within the window (which can usually be narrowed by common knowledge of ascendants) that agrees with all the progressed aspects entailed by it, you will be able to use common interpretation with the functional time to derive outstandingly accurate natal charts that can show the reader the inner workings of a person. Confirmed astrological birth times are crucial to extensive interpretation. Most people can get most information without rectification, but some must rectify and all should.
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