Tuesday, October 13, 2015

Nighttime Losings Time

The sun is setting on a monumental day in the solar year.

Nighttime Losings Time


The astronomical equinox is four days away, but we are on the threshold of a critical equinoctial moment.

As of tomorrow, the days will be longer than the nights, and by two whole minutes. The sun will rise at 7:08 a.m. EDT, and set at 7:10 p.m.

We were alerted to this cosmic event by esteemed colleague Tom Infield, who has been known to count minutes on company time.

He informed us somewhat excitedly this morning that today was the day of precisely 12 hours of daylight.

That was based on his interpretation of an iPhone app provided by a commercial service. But according to the U.S. Naval Observatory, today has only 11 hours and 59 minutes of daylight in Philadelphia.

As much as we trust Infield with such important information, we have to go with the military.

We can say with certainty that daylight is gaining ground at the rate of about 2.5 minutes per calendar day.

We can also say that all this is all in the realm of technicality: Spring actually arrived around Dec. 1.





Inquirer Weather Columnist
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About this blog

Everyone talks about the weather, and here we write about it.

When we’re around and conditions warrant, we’ll keep you updated about what’s coming, but we will do our best always to discuss weather and climate developments in context and remind you that nothing in the atmosphere happens in a vacuum.

Tony Wood has been writing about the atmosphere for The Inquirer for 26 years.

Reach Tony at twood@phillynews.com.

Tony Wood Inquirer Weather Columnist
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