Since I'm spending so much time here, I thought I should do a Raleigh sunrise chart to complement the one for Chicago. (You can get one for your own location at http://www.wx-now.com/Sunrise/SunriseChart.aspx.)

...could be today, depending on which competing definition you use:

A blue moon is a full moon that is not timed to the regular monthly pattern. Most years have twelve full moons which occur approximately monthly, but in addition to those twelve full lunar cycles, each solar calendar year contains an excess of roughly eleven days compared to the lunar year. The extra days accumulate, so that every two or three years (7 times in the 19-year Metonic cycle), there is an extra full moon. The extra moon is called a "blue moon." Different definitions place the "extra" moon at different times.

• In calculating the dates for Lent and Easter, the Clergy identify the Lent Moon. It is thought that historically when the moon's timing was too early, they named an earlier moon as a "betrayer moon" (belewe moon), thus the Lent moon came at its expected time.
• Folklore gave each moon a name according to its time of year. A moon which came too early had no folk name – and was called a blue moon – bringing the correct seasonal timings for future moons.
• The Farmers' Almanac defined blue moon as an extra full moon that occurred in a season; one season was normally three full moons. If a season had four full moons, then the third full moon was named a blue moon.
• Recent popular usage defined a blue moon as the second full moon in a calendar month, stemming from an interpretation error made in 1946 that was discovered in 1999. For example, December 31, 2009 would be a blue moon according to this usage.

So, it's possible today's full moon is a blue moon. Or it's possible the next blue moon will occur November 21st. Or after some volcanic eruption which hasn't happened yet.

Regardless, enjoy it if you can. It only happens...infrequently.

It's time for the semi-annual update of the Chicago sunrise chart. (You can get one for your own location at http://www.wx-now.com/Sunrise/SunriseChart.aspx.)

An interesting note about 2010: the sunset on November 6th will be the latest sunrise in Chicago (7:30am) until 2021—and that, only within 4 seconds of precision.

A number of confusing changes occurred to the world while I slept:

• President Obama won the Nobel Peace Prize. I love the man; I voted for him; I gave lots of money[1] to two of his campaigns. I'm still confused. It might offend some of my fellow progressives to say, but possibly the prize means nothing more than "thank you for not being like the last guy, and keep up the good work." The President is, in fact, the second person who is not George W. Bush to win the Prize in the last four years.
• For reasons which passeth all understanding[2], we crashed a rocket into the moon. We want to find out if the moon has enough water to make long-term habitation possible. Otherwise, we'll have to build a pipeline from the Great Lakes, which poses certain engineering challenges.

More items and an explanation of this photo after the jump.

It's time for the semi-annual update of the Chicago sunrise chart. (You can get one for your own location at http://www.wx-now.com/Sunrise/SunriseChart.aspx.)

(Chart after the jump.)