Solstice

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Lucianne Walkowicz: Finding planets around other stars | Video on TED.com

In the northern hemisphere, the longest day of the year (near June 22) when the Sun is farthest north.

Summer Solstice -- from Eric Weisstein's World of Astronomy

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

winter_solstice_pivato.jpg (JPEG Image, 1280 × 554 pixels)

During the course of a year the Earth completes one orbit around the Sun.

Mus, RMG | Equinoxes & solstices | Time fact files | Astronomy & time

http://www.rmg.co.uk/explore/astronomy-and-time/time-facts/equinoxes-and-solstices