posted by Heather .
Where do you have to be on the Earth to see the Sun at your zenith? If you stay at one such location for a full year, on how many days will the Sun pass through the zenith?
The sun can only appear at zenith between the Tropic of Cancer (latitude 23.5 North) and the Tropic of Capricorn (latitude 23.5 South).
Between those latitudes, it will pass by zenith twice a year: once the way north and once on the way south (at noon).
At the tropics of Cancer and Capricorn, it will only reach zenith on the summer solstice (once).