Convert Quarters to Solar Masses
Convert Quarters (qr) to Solar Masses (M☉) instantly and accurately.
Conversion Formula
M☉ = qr × 6.385669791e-30
About Quarters
A quarter (qr) in the avoirdupois system equals 28 pounds or one quarter of a hundredweight - approximately 12.70 kg. Historically, quarters were used in British trade for measuring grain, wool, and other bulk commodities. The British quarter of grain (28 lb) was the standard purchase quantity at markets and mills throughout medieval and early modern England. In the US, the term 'quarter' sometimes refers to a quarter of a short hundredweight (25 lb) rather than the British 28 lb.
About Solar Masses
A solar mass (M☉) is the mass of our Sun - approximately 1.989 × 10³⁰ kg - and is the standard unit for measuring stellar and galactic masses in astronomy. The Sun contains 99.86% of the total mass of the Solar System. Stellar evolution models describe stars of 0.08 M☉ (the minimum for hydrogen fusion) to over 200 M☉ (the most massive known stars). Supermassive black holes at the centres of galaxies range from millions to billions of solar masses: the black hole at the centre of the Milky Way (Sagittarius A*) is approximately 4.3 million M☉.
Quick Reference Table
| Quarters (qr) | Solar Masses (M☉) |
|---|---|
| 1 qr | 6.386 × 10-30 M☉ |
| 2 qr | 1.277 × 10-29 M☉ |
| 5 qr | 3.193 × 10-29 M☉ |
| 10 qr | 6.386 × 10-29 M☉ |
| 25 qr | 1.596 × 10-28 M☉ |
| 50 qr | 3.193 × 10-28 M☉ |
| 100 qr | 6.386 × 10-28 M☉ |