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Ken Ward's Astrology Pages

Astrology: Calculating the House Cusps.

Example: Mary was born 7 May 1982 at 11 hours 17 minutes AM, New Berlin, New York, USA. The longitude is 75 degrees, 20 minutes west of Greenwich. And the latitude is 42 degrees 37 minutes North of the equator.

Her LST is 1 hour 16 minutes 13 seconds.

Having calculated the sidereal time and other factors previously, we can go on to calculate the house cusps for the Placidean system. All we need to calculate are four cusps, because we have already calculated the Ascendant and the MC and the other cusps are opposite these ones.

We can proceed as with the ascendant and we can use the same factors as before. The factor for latitude is 0.6167 and the factor for time is 0.0542..

My results are as follows:

Time	1 hour 16
Latitude	11	12	2	3
42 degrees	2731	356	2452	1924
43 degrees	2743	427	257	1927
42 degrees 37	2738	415	2501	1926

Time	1 hour 20
Latitude	11	12	2	3
42 degrees	2834	449	2543	2022
43 degrees	2848	520	2557	2024
42 degrees 37	2843	508	2551	2023
Values	2742	417	2504	1929

Cusp Values
11	12	2	3
2742	417	2504	1929
5	6	8	9
2742	417	2504	1929

The cusps 5,6,8 and 9 are obtained by reversing the sign on the other cusps. The results are accurate to an arcminute.