Convert Tropical Years to Gigayears
Convert Tropical Years (a_trop) to Gigayears (Ga) instantly and accurately.
Conversion Formula
Ga = a_trop × 9.999991512e-10
About Tropical Years
The tropical year = time from March equinox to the next = 365.24219 days = 31,556,925.2 s - the year that governs the seasons. The Gregorian 97/400 leap rule approximates it as 365.2425 days, leaving a residual drift of only ~26.8 s/year. The tropical year shortens ~0.53 s per century due to tidal deceleration. Persian Solar Hijri and Mayan Haab' calendars also approximate it. 1 a_trop ≈ 365.24219 d.
About Gigayears
A gigayear (1 Ga) = 10⁹ yr ≈ 3.156 × 10¹⁶ s - the timescale of stellar evolution and cosmology. Universe age: 13.787 ± 0.020 Ga (Planck CMB). Sun: 4.603 Ga old; red giant in ~5 Ga. A 0.1 M☉ red dwarf lives ~10,000 Ga. Uranium-238 half-life = 4.468 Ga (used in radiometric dating). Proton decay (GUT prediction): ~10³⁴ yr = ~10²⁵ Ga. 1 Ga = 10⁹ yr.
Quick Reference Table
| Tropical Years (a_trop) | Gigayears (Ga) |
|---|---|
| 1 a_trop | 10 × 10-10 Ga |
| 2 a_trop | 2 × 10-9 Ga |
| 5 a_trop | 5 × 10-9 Ga |
| 10 a_trop | 10 × 10-9 Ga |
| 25 a_trop | 2.5 × 10-8 Ga |
| 50 a_trop | 5 × 10-8 Ga |
| 100 a_trop | 10 × 10-8 Ga |