Saving daylight again

Time again to haul out the daylight savings chart...


...and take a look at what happened at 2:00 this morning.

For those of us here in Indianapolis, when we step out the door this morning, we’ll be finding it much darker than it was a day or so ago. We had just managed a sunrise before 7:00 (or would have, if it hadn’t been pouring rain yesterday), but this morning’s sunrise has been bumped back to almost 8:00.  We won’t see the sun peek over the horizon before 7:00 until April 20 - more than a month from now.  In fact, at 7:00 we’re all the way back unto what the astronomers call “nautical twilight,” which is as good as total darkness for those of us in urban areas.

At the other end of the day, those of us whose homeward commute ends around 7:00 will suddenly find it full daylight all the way until we pull in the drive. The extra end-of-day sunlight is probably a good thing, as everyone on the road will be dozy from having gotten up an hour earlier Monday morning.

Worth it?  It’ll take me a week or so to get my biorhythms adjusted, and the later sunrise won’t help.

My previous rants about DST are here and here.  For the OCD-ers among us, I’ve put a 2010 version of my earlier “How dark is it?” charts below the break...

How dark is it? - 2010 versions!

How dark is it at 6 a.m.?
without Daylight Saving:

Full Darkness	January 1 - February 20	51 days
Astronomical Twilight	February 21 - March 13	21 days
Nautical Twilight	March 14 - April 2	20 days
Civil Twilight	April 3 - April 19	17 days
Daylight	April 20 - August 19	122 days
Civil Twilight	August 20 - September 17	29 days
Nautical Twilight	September 18 - October 19	32 days
Astronomical Twilight	October 20 - November 19	31 days
Full Darkness	November 20 - December 31	42 days

with Daylight Saving:

Full Darkness	January 1 - February 20	51 days
Astronomical Twilight	February 21 - March 13 (clocks go ahead March 14)	21 days
Full Darkness	March 14 - March 30	17 days
Astronomical Twilight	March 31 - April 18	19 days
Nautical Twilight	April 19 - May 14	26 days
Civil Twilight	May 15 - July 18 (no Daylight: earliest sunrise 6:16)	65 days
Nautical Twilight	July 19 - August 21	34 days
Astronomical Twilight	August 22 - September 21	31 days
Full Darkness	September 22 - November 6 (clocks go back November 7)	46 days
Astronomical Twilight	November 7 - November 19	13 days
Full Darkness	November 20 - December 31	42 days

How dark is it at 7 a.m.?
without Daylight Saving:

Astronomical Twilight	January 1 - January 16	16 days
Nautical Twilight	January 17 - February 22	37 days
Civil Twilight	February 23 - March 12	18 days
Daylight	March 13 - October 20	222 days
Civil Twilight	October 21 - November 15	26 days
Nautical Twilight	November 16 - December 25	40 days
Astronomical Twilight	December 26 - December 31	6 days

with Daylight Saving:

Astronomical Twilight	January 1 - January 16	16 days
Nautical Twilight	January 17 - February 22	37 days
Civil Twilight	February 23 - March 12	18 days
Daylight	March 13 Only one day... oh, the agony! (clocks go ahead March 14)	1 day
Nautical Twilight	March 14 - April 1	19 days
Civil Twilight	April 2 - April 19	18 days
Daylight	April 20 - August 19	122 days
Civil Twilight	August 20 - September 17	29 days
Nautical Twilight	September 18 - October 19	32 days
Astronomical Twilight	October 20 - November 6 (clocks go back November 7)	18 days
Civil Twilight	November 7 - November 15	9 days
Nautical Twilight	November 16 - December 25	40 days
Astronomical Twilight	December 26 - December 31	6 days

How dark is it at 8 a.m.?
without Daylight Saving:

Civil Twilight	January 1 - January 21	21 days
Daylight	January 22 - December 17	330 days
Civil Twilight	December 18 - December 31	14 days

with Daylight Saving:

Civil Twilight	January 1 - January 21	21 days
Daylight	January 22 - October 20	272 days
Civil Twilight	October 21 - November 6 (sun rises after 8:00 DST)	17 days
Daylight	November 7 - December 17	41 days
Civil Twilight	December 18 - December 31	14 days

How dark is it at 8 p.m.?
without Daylight Saving:

Full Darkness	January 1 - February 22	53 days
Astronomical Twilight	February 23 - March 24	30 days
Nautical Twilight	March 25 - April 28	35 days
Civil Twilight	April 29 - May 22	24 days
Daylight	May 23 - July 30	69 days
Civil Twilight	July 31 - August 21	22 days
Nautical Twilight	August 22 - September 10	20 days
Astronomical Twilight	September 11 - September 29	19 days
Full Darkness	September 30 - December 31	93 days

with Daylight Saving:

Full Darkness	January 1 - February 22	53 days
Astronomical Twilight	February 23 - March 13 (clocks go ahead March 14)	19 days
Nautical Twilight	none	0 days
Civil Twilight	March 14 - March 22	9 days
Daylight	March 23 - September 11	173 days
Civil Twilight	September 12 - September 27	16 days
Nautical Twilight	September 28 - October 18	21 days
Astronomical Twilight	October 19 - October 31	13 days
Full Darkness	November 1 - December 31	61 days

How dark is it at 9 p.m.?
without Daylight Saving:

Full Darkness	January 1 - April 14	104 days
Astronomical Twilight	April 15 - May 13	29 days
Nautical Twilight	May 14 - August 4 No Civil Twilight or Daylight, latest sunset is 8:17 p.m.	83 days
Astronomical Twilight	August 5 - August 27	23 days
Full Darkness	August 28 - December 31	126 days

with Daylight Saving:

Full Darkness	January 1 - March 13	72 days
Astronomical Twilight	March 14 - March 24	11 days
Nautical Twilight	March 25 - April 28	35 days
Civil Twilight	April 29 - May 22	24 days
Daylight	May 23 - July 30 (latest sunset 9:17p DST)	69 days
Civil Twilight	July 31 - August 21	22 days
Nautical Twilight	August 22 - September 10	20 days
Astronomical Twilight	September 11 - September 29	19 days
Full Darkness	September 30 - December 31	93 days

Posted by: Old Grouch in Rants at 01:06:23 GMT | No Comments | Add Comment
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