Tag: equal

#365daysofbiking The world spins

March 18th – I keep banging on about equinoxes, and like the idiot I surely am, I thought I knew about them. It turns out like many things I think I understand, there’s so much more to it than I knew.

Today, the length of the daylight was near as damn it 12 hours: the sunrise was 6:16am and sunset a 6:15pm. Tomorrow, the daylight will be longer than night.

But this is not the equinox (when the sun crosses the equator). This is the equilux – equal light. Although, it’s not really equal at all: A number of factors including how we might use the three definitions of twilight complicate this.

I looked it up tonight and was fascinated. The equinox actually happens on March 20th this year – that’s Wednesday.

You can find out all the gory detail of how this stuff works at this excellent blog post here – the comments are worth a read too if you have time to spare.

You learn something new every day.

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March 17th  – Something interesting will happen between today and tomorrow. Thanks to the GPS based bike computer I use these days, I’ve been keeping an eye on sunrise and sunset times to measure the progress of the seasons. Today, the daylight will be just shorter than the night; by tomorrow, the day will be longer by about the same.

This is effectively the spring equinox – when day and night are equal length of 12 hours. This isn’t quite the astronomical equinox, which this year occurs on the 20th, but it’s good enough for me. 

Another milestone of the changing seasons and the ascent from darkness.