Chart Point Returns

A return chart is calculated for the exact date and time that a chart point returns to its longitude in the base chart. If the base chart uses the tropical zodiac, then the return is to the same point in the tropical zodiac (unless it is precession corrected). If it is sidereal then the return is to the same point in the sidereal zodiac. The program iterates in time to find the correct date and time of the return. For planets other than the Sun, Moon and Earth, an approximation to the time of the return is found initially by doing a heliocentric return. (For Mercury, Venus and Vulcan, an Earth return is used.) A search is then made for geocentric returns on either side of the heliocentric return date, until the date or angle exceeds the possible limits for finding further geocentric returns.

In the calculation of returns, the accuracy of the return time is calculated by dividing the accuracy of the planet's position by the speed of the planet at the time of the return, both for the natal chart and for the return chart, and these are added together. This method gives a reasonable assessment of accuracy in most cases. However, the accuracy of Pluto returns outside the range 1890-2099 is likely to be much worse than is indicated by this method.

 

Wynn-Key Return

This chart is calculated with the planetary positions for the date for which the Wynn-Key chart is required, but the chart angles are based on the preceding and following Solar return chart angles. The R.A. of the midheaven is determined by interpolating between the R.A.s of the two Solar Returns (which are typically about 6 hours apart), based on the proportion of time that has elapsed between them at the required date.

 

Progressed Solar Return

This chart uses planetary positions determined by a performing a secondary progression of the planets in the preceding Solar Return, to the date of the required return chart. However the chart angles are determined by interpolating between the R.A.s of the Midheavens of the preceding and following solar returns. The progressed R.A.of the midheaven is deemed to move through an entire rotation in addition to the exact difference between the two R.A.s of the returns (i.e. about 30 hours altogether). The R.A. of the resulting chart is based on the proportion of time that has elapsed between the two returns at the required date. This return type is also known as a Progressed Solar-Sidereal Return (or PSSR) chart.

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