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2019-06-19, 11:59 AM (ISO 8601)
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#4
Bugbear in the Playground
Re: Measuring an unknown world / solar system
If there are moons with vaguely similar orbits to Earth's Moon, you can estimate their distances by:
- measuring parallax from widely separated observing points; or
- measuring parallax between different times of day (diurnal parallax); or
- measuring the size of your planet's shadow on a moon during a lunar eclipse
The latter two methods need your previously estimated diameter of the new earth.
Or you could use radar, if you are willing to use 20th century technology.