Whenever the subject of mosquito control comes up, someone gives a fervent argument for installing purple martin houses and bat houses. Stores that cater to bird enthusiasts often tout the purple martin houses as the best solution for keeping your yard mosquito free.
A short period comet is conventionally defined as a comet having an orbital period of less than 200 years. What is the maximum possible aphelion distance for a short period comet with a perihelion of 0.5 AU? Where does this place the comet relative to the outer planets? (3)
The orbital period of the Moon is about 27 days or 38880 minutes, the time it takes for the Moon to return to a position on the celestial sphere. The time from one new moon to the next is 2.21 days longer, because it requires the Moon's position to catch up with that ot the Sun, and the Sun's position in the sky changes during the time, due of the Earth's orbital motion).