- Joined
- Oct 26, 2007
- Messages
- 277
- Reaction score
- 37
What Earth Would Look Like With Rings Like Saturn (YouTube video)
I myself have crunched the numbers on its appearance and behavior, and for a reasonable size (1.5 to 2.5 Earth radii), I find:
If they behave like Saturn's rings, then their shadowed side will be darker than their sunlit side by about a factor of 2 or so.
The rings will be brightest at the solstices, and dimmest at the equinoxes.
At midlatitudes away from the equinoxes, the rings would be so bright that they would make the sky a perpetual twilight. Their luminosity: about a few thousand lux (the full Moon: 1 lux). One would be able to read by their light. But a day from the equinoxes, their brightness would go down to about 50 lux, which is still brighter than the full Moon.
The rings will be warped about 6m of arc by the competing gravity of the Earth's equatorial bulge, the Moon, and the Sun. At the equator, one will be able to observe that width, and it will make the rings' maximum brightness about 20 lux, declining to 0.3 lux near the equinoxes.
The rings will not be visible from latitudes greater than about 60d.
Visibility of some celestial objects:
So it would be VERY hard to do astronomy without going to far northern or southern latitudes. However, on the plus side, astrology would likely be much less well developed.
But it will be almost absurdly easy to discover from the Earth's shadow on the rings that the Earth is approximately spherical. One will also see the Moon's shadow on the rings when the Moon is making a solar eclipse.
I myself have crunched the numbers on its appearance and behavior, and for a reasonable size (1.5 to 2.5 Earth radii), I find:
If they behave like Saturn's rings, then their shadowed side will be darker than their sunlit side by about a factor of 2 or so.
The rings will be brightest at the solstices, and dimmest at the equinoxes.
At midlatitudes away from the equinoxes, the rings would be so bright that they would make the sky a perpetual twilight. Their luminosity: about a few thousand lux (the full Moon: 1 lux). One would be able to read by their light. But a day from the equinoxes, their brightness would go down to about 50 lux, which is still brighter than the full Moon.
The rings will be warped about 6m of arc by the competing gravity of the Earth's equatorial bulge, the Moon, and the Sun. At the equator, one will be able to observe that width, and it will make the rings' maximum brightness about 20 lux, declining to 0.3 lux near the equinoxes.
The rings will not be visible from latitudes greater than about 60d.
Visibility of some celestial objects:
- Venus at its brightest will always be visible
- Mercury, Mars and Jupiter at their brightest will not be visible from midlatitudes at the solstices, but will be visible at other times and places
- Sirius will be visible at the equator and a few days from the equinoxes at midlatitudes
- Saturn, Vega, and Alpha Centauri will be visible at the equator, but only very briefly at midlatitudes - at best
So it would be VERY hard to do astronomy without going to far northern or southern latitudes. However, on the plus side, astrology would likely be much less well developed.
But it will be almost absurdly easy to discover from the Earth's shadow on the rings that the Earth is approximately spherical. One will also see the Moon's shadow on the rings when the Moon is making a solar eclipse.