Series
Computed sky
The astronomy and arithmetic underneath every chart, worked in the open. One full computation per essay, redoable on paper. Written by Meghnad Chitnis.
computed-sky
Why your moon sign changes between apps
Two apps agree about the sky and disagree about where zero is. What an ayanamsha does, why the named ones differ, and why software must state its zero.
computed-sky
The arithmetic of Vimshottari
The whole dasha algorithm worked by hand: 120 years, nine weights, a starting point read off the Moon, and sub-periods by simple proportion.
computed-sky
The slow clock of precession
The 26,000-year wobble under every chart: its rate, how Hipparchus caught it with two old numbers, and why the nakshatras and the seasons drift apart.
computed-sky
What a birth chart actually computes
A chart is ten numbers and a set of stated conventions. The pipeline from clock time to signs and houses, sorted into what is fixed, chosen, and read.