posted August 30, 2015 03:56 PM
Generally +/- 0*05', depending on the planet. That's five minutes arc.But it should be noted that major life events do not take place with a single progressed aspect unless it is exact, orb=0*00'. Otherwise it takes at least two, often three or more simultaneous aspects within these orbs.
The following refers to the progressing planet as it moves relative to a stationary or natal point.
Luminaries slightly wider: 06'-07' (Moon possibly a bit wider to 12', but only if supporting aspects happen simultaneously).
Merc-Venus-Mars: 04'
Jupiter: 05'
Saturn: 04'-05'
Uranus: 03'-04'
Neptune: 03-4'
Pluto: 03-4'
-- all in minutes of arc --
(Neptune and Pluto amended 8 June 2016 after obtaining enough evidence of wider orbs)
This does not mean that if no progressed aspects are this tight that there is not a functioning aspect say around 08' orb. If that is the tightest one in the chart at that time, then it is most 'active' -- at least if it is applying.
The wider stretch of orbs always happening on the applying side. So prog Moon applying to square to natal point can be active while still 0*07' from culmination. With that much separation from culmination events are less likely to take place unless there are still much tighter, more active aspects taking place.
Most likely, however, if the progressed aspectarian shows nothing within the orbs I have specified, then it is not displaying minor 15-degree aspects (15, 75, 105, 165), and there is one active; or the active aspects are in declination. The latter is most often true.
Addendum
It seems incomplete without giving some basic tips on how to quickly reveal the more exact, active aspects in the progressed chart. Basically, narrow the orbs waaayy down. In astro.com you are given the option to set the % of full orb. Set to 8-9% it appears to include all active, tight aspects, including minors. This clears all the irrelevant data off the aspectarian. That is very important, because otherwise you will strain your eyes/brain looking to find the needles in the number haystack there.
If you want to include all minor 15* aspects in the progressed chart, and your program does not give that option, then read my method of how to find them here:
http://www.linda-goodman.com/ubb/Forum24/HTML/232564.html
With declinations, you will just have to go through the list showing each planet's declination position, comparing to other prog planets and to the natal ones.
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The Declinations Guy
Complete Rising Sign Descriptions