Difference between revisions of "Sawyers World"
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* Largest city: Sawyer City | * Largest city: Sawyer City | ||
| + | Time | ||
| + | * Year: 631.11 local days (so 631 days and a leap year every 9th year), 677.13 Earth days. (About 10 days shorter than a Martian year.) | ||
* Rotation: 25h 44m 17s (solar, ie noon to noon) | * Rotation: 25h 44m 17s (solar, ie noon to noon) | ||
* Calendar: week = 5 26-hour days plus 2 25-hour days, with every 4th weekend having an extra hour. | * Calendar: week = 5 26-hour days plus 2 25-hour days, with every 4th weekend having an extra hour. | ||
| + | ** 12 months, 5 of 52 days, 7 of 53 days, similar alternating pattern as Earth western calendar months. | ||
| + | ** Alternate one: 21 months, 10 of 29 days, 11 of 31 days, alternating. | ||
| + | ** Alternate two: 21 months, 20 of 30 days, 1 (last of the year) of 31 days. | ||
| + | ** Earth calendar and time (UTC -- which is now becoming truly universal) is also maintained for reference (file timestamps, etc.) | ||
| + | Size | ||
* Radius: slightly larger than Earth, about 1.05 E, 8400 miles diameter (8320 miles) | * Radius: slightly larger than Earth, about 1.05 E, 8400 miles diameter (8320 miles) | ||
* Density: slightly lower than Earth, about 5.2 gm/cm3, similar to Venus (5.23 gm/cm3) | * Density: slightly lower than Earth, about 5.2 gm/cm3, similar to Venus (5.23 gm/cm3) | ||
Revision as of 04:02, 27 April 2017
Sawyers World
Habitable planet orbiting Alpha Centauri A, (Alpha Centauri A II)
First extra-solar planet settled by humans (but not first landed upon, see Kakuloa).
- Largest city: Sawyer City
Time
- Year: 631.11 local days (so 631 days and a leap year every 9th year), 677.13 Earth days. (About 10 days shorter than a Martian year.)
- Rotation: 25h 44m 17s (solar, ie noon to noon)
- Calendar: week = 5 26-hour days plus 2 25-hour days, with every 4th weekend having an extra hour.
- 12 months, 5 of 52 days, 7 of 53 days, similar alternating pattern as Earth western calendar months.
- Alternate one: 21 months, 10 of 29 days, 11 of 31 days, alternating.
- Alternate two: 21 months, 20 of 30 days, 1 (last of the year) of 31 days.
- Earth calendar and time (UTC -- which is now becoming truly universal) is also maintained for reference (file timestamps, etc.)
Size
- Radius: slightly larger than Earth, about 1.05 E, 8400 miles diameter (8320 miles)
- Density: slightly lower than Earth, about 5.2 gm/cm3, similar to Venus (5.23 gm/cm3)
- Gravity: slightly lower than Earth, about 0.99 g (9.7 m/sec2) (0.986 g, 9.682 m/sec2)
(But escape velocity slightly higher, due to 1/r-squared: 11.42 km/sec vs 11.18 km/sec, and get a 0.41 km/sec boost from rotation at equator (vs 0.44 on Earth)
- Specifically, Ve = 11.49 km/sec, rotation boost = 0.45 km/sec at equator, 0.32 at 45 deg lat.
Sources
- The Chara Talisman ("we're here 26 hours a day")
- Alpha Centauri, First Landing (discussion of planetary parameters on initial survey)