Calculating…
The Sun is in sidereal Taurus from May 15, 2026 to June 15, 2026 in 2026, using the Lahiri ayanamsa. The window opens about three weeks after tropical Taurus begins on April 19–20, reflecting the 24.21° accumulated offset between the equinox and the actual Taurus star band.
Tropical Taurus begins when the Sun crosses 30° of the tropical zodiac — a fixed geometric point tethered to the spring equinox. Sidereal Taurus begins when the Sun enters the Taurus constellation, the region of the ecliptic occupied by the Pleiades, Hyades, and Aldebaran. Earth’s axis precesses at 50.3 arcseconds per year, meaning the equinox-based zodiac drifts steadily backward relative to the star patterns. In Ptolemy’s era (2nd century CE) the two zodiacs nearly aligned; today they diverge by roughly 24.21° — just over 24 days of solar travel. The Lahiri ayanamsa captures this drift precisely, making it the standard calculation in Indian astrological tradition since 1955. The practical upshot: every tropical Taurus Sun becomes a sidereal Aries Sun under Lahiri — unless the Sun is in the final 6° of tropical Taurus, where it crosses into sidereal Taurus instead.
Why sidereal differs from tropical →
Lahiri’s ayanamsa increases by about 50.3 arcseconds yearly, shifting the sidereal Taurus entry date by roughly 20 minutes per decade. For 2026 that means around May 14; by 2036 the ingress is still around May 14, but a few hours later in UTC. That precision becomes relevant only for people born within a day of the Taurus–Aries boundary — everyone else sees no practical difference. The table below lists exact UTC ingress and egress times for 2023 through 2029, making it a useful reference for rectification work and historical research.
| Year | Sun enters | Sun exits |
|---|---|---|
| 2023 | May 15, 2023 | June 15, 2023 |
| 2024 | May 14, 2024 | June 14, 2024 |
| 2025 | May 14, 2025 | June 15, 2025 |
| 2026 | May 15, 2026 | June 15, 2026 |
| 2027 | May 15, 2027 | June 15, 2027 |
| 2028 | May 14, 2028 | June 14, 2028 |
| 2029 | May 14, 2029 | June 15, 2029 |
Enter your birth date to find which sidereal sign the Sun was in.
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