dailybell: Accordion Sun Crossings

Wednesday, June 18, 2008

Accordion Sun Crossings

Here’s the approach and departure to and from the summer Solstice this year.
In San Francisco, the sun rose at 5:47 AM everyday this week (June 9 – 16). The sunset, however, continued to creep a little bit later each day. Imagine a ball tossed into the air as it reaches the top of the arc. This is how I think of the rate of change in sunlight at the end of the day. As the sun rounds the far end of it’s ellipse, the rate of change slows down. The sunrise has reached its earliest point for the year while the sunset is edging to it’s latest point. The latest time that the sun sets is 8:36PM and it continues to set at that time from June 23- July 2.
Solstice Info

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