On 21 June (the Summer Solstice in the Northern Hemisphere), consider the day length at the following latitudes:

1. The Equator (0°)

2. The Tropic of Cancer (23.5°N)

3. The Arctic Circle (66.5°N)

4. The Tropic of Capricorn (23.5°S)

At how many of the above latitudes does day length exceed 12 hours on 21 June?