What the D40 chart is read for
The D40 is read for what descends through the maternal line: dispositions, advantages and difficulties inherited from the mother's family rather than the father's. Classical usage is broader than that - general auspiciousness and inauspiciousness - but the maternal reading is what distinguishes it from its pair, the D45. It belongs to the fine vargas, used to confirm a judgement already formed rather than to start one.
How the D40 is calculated
Each sign divides into forty parts of 45'. At this fineness a planet crosses an amsa boundary in a few minutes of birth time, which is why the D40 is only as good as the time it was cast from.
| Property | Value |
|---|---|
| Division | D40 |
| Span of one amsa | 45' |
| Amsas across the zodiac | 480 |
Reading it alongside the birth chart
Use it late. Form the judgement in the D1 and the governing varga, then check the D40 as a confirmation of strength with a maternal-line flavour. It is not a chart to reason from on its own.
What a divisional chart will not tell you
At forty divisions per sign, an unrectified birth time makes this chart unreliable - not subtly wrong, but arbitrarily wrong. If the birth time is uncertain to more than a minute or two, the D40 should not be leaned on.
Frequently asked
- What is the Khavedamsa chart used for?
- Effects carried through the maternal line, and general auspiciousness. It is a confirming chart, used to check a judgement already formed from the birth chart.
- How accurate does my birth time need to be for the D40?
- Very. Each amsa spans 45', so a planet can change amsa within a couple of minutes of birth time. With an uncertain time, the D40 is not worth leaning on.
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