Calendar

The International Space Station reaches maximum brightness on June 1, with multiple passes each evening (favoring those in the northern hemisphere.) Follow the link on this calendar entry to find out when and where to look for your location.

In the northern hemisphere, the longest day of the year when the Sun is farthest north. In the southern hemisphere, winter and summer solstices are exchanged. The summer solstice marks the first day of the season of summer. The declination of the Sun on the (northern) summer solstice is known as the tropic of cancer (23° 27′).

http://scienceworld.wolfram.com/astronomy/SummerSolstice.html