posted May 23, 2018 01:03 PM            

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Originally posted by Asterkind:
How to calculate ic, desc and mc from asc? Is it straight 90 degrees each from asc?

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Rarely, and only if you were born in an equatorial region (between 28° north and south latitude). You see, the relationship between Asc and Midheaven changes on an ongoing basis. For the Midheaven to be exactly 90° square to the Asc, you'd have to be born in just the right area and time of day.

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Bcos from astro.com i see slight variation in the per house cusp position. Thanks..

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That is because houses are not supposed to be exactly the same in arc span -- unless you were born at just the right place and time for that happen.

So Aries23 is right. Astro.com pretty well knows what they're doing.