Western
Zero is the equinox.
Western astrology puts 0° Aries at the spring equinox — the March moment when day and night are equal. The zodiac is pinned to the seasons.
Vedic and Western · the one real difference
Both charts measure the same sky. They start counting from different places.
Vedic
Zero is a fixed star.
Vedic astrology puts 0° Aries at a fixed point among the stars (anchored to the star Spica). The zodiac is pinned to the star field.
Both use twelve equal 30° signs. Both use identical planet positions. The only disagreement is where the counting starts.
The calendar you already use
You have already seen this gap.
Makar Sankranti falls on 14 January, but the actual shortest day of the year is 21 December. Baisakhi falls on 14 April, but the actual spring equinox is 20 March. Those festivals mark the Sun entering Capricorn and Aries in the Vedic zodiac. The solstice and equinox are the Sun entering them in the Western zodiac. The Sun moves about one degree a day — so a 24-degree gap in the chart shows up as a 24-day gap in the calendar. Same number, two places.
Dec
Jan
Feb
Mar
Apr
24 days = 24 degrees
21 Dec · shortest day
Sun enters Capricorn · Western
14 Jan · Makar Sankranti
Sun enters Capricorn · Vedic
24 days = 24 degrees
20 Mar · spring equinox
Sun enters Aries · Western
14 Apr · Baisakhi
Sun enters Aries · Vedic
Two wheels, one sky
Watch the two zero points drift apart.
Outer wheel · Western 0° Aries, the March equinox
Inner wheel · Vedic 0° Aries, anchored to the star Spica
Drag through time: 285 CE → today
24°08'gap between the two zero points
2026 CE
285 CE · gap 0°00'2026 · gap 24°08'
Earth wobbles on its axis like a slowing top, one full wobble every 25,800 years. That makes the equinox point slide backward against the stars at 50.3 arcseconds a year — one degree every 72 years. Around 285 CE the two zero points sat in the same place. Today they are 24°08' apart. Astrologers call this gap the ayanamsa, meaning the distance between the two starting points.
Because a sign is 30° wide and the gap is 24°, about four people in five find their Sun in the previous sign. If you were born in the first 24 days of your Western sign's range, it shifts back. The last six days stay put.
Where the maths parts ways
One subtraction, and only one.
01
Birth date, time, place
One moment: 14 August 1992, 06:42, Pondicherry.
02
Calculate where every planet actually was
The Sun at that moment sits at one specific spot in the sky. Both traditions use the same astronomy tables to find it.
Both systems agree completely here
Path A · Western
Measure from the equinox point
The Sun's position is counted from the March equinox. A Sun at 24° from that point is read as 24° Leo.
Path B · Vedic
Subtract 24°08' to measure from the fixed star
The same position is counted from the star-anchored zero instead. Take 24°08' off and the same Sun reads as 0° Leo — or slips into Cancer.
The whole difference
That subtraction is the only calculation that differs between the two systems.
Everything else that differs — how houses are cut, how planets aspect each other, how timing is read — is a separate design choice, and would still differ even if both traditions agreed about zero.
See both charts drawn from your own birth moment.
Modules 00–04 are free in full on either path. One $21 purchase covers both.
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