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positively4thsteet
01 Jan 10 15:27
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Date Joined: 22 Oct 09
| Topic/replies: 6,492 | Blogger: positively4thsteet's blog
I love this time of year, gaining another minute here another minute there everyday as the days get longer. 12 days since the shortest day - we are already one fifteenth of the way back to the longest day. The rate of "increase in length of day" also increases until it hits a peak at the spring (vernal'?) equinox. Roll on summer.

sunrise/sunset times for january.... (bearing in mind I reckon you can add half an hour to the sunset time, because it isn't proper dark until at least half an hour after the time quoted below)

date, sunrise, sunset, hours of daylight, increase in daylight hours since yesterday, some other stuff.

1 Jan 2010 08:06 16:02 7h 55m 55s + 1m 05s 12:04 15.6° 147.098
2 Jan 2010 08:06 16:03 7h 57m 07s + 1m 11s 12:04 15.7° 147.097
3 Jan 2010 08:06 16:04 7h 58m 24s + 1m 17s 12:05 15.8° 147.097
4 Jan 2010 08:06 16:05 7h 59m 48s + 1m 23s 12:05 15.9° 147.097
5 Jan 2010 08:05 16:07 8h 01m 17s + 1m 29s 12:06 16.0° 147.099
6 Jan 2010 08:05 16:08 8h 02m 52s + 1m 35s 12:06 16.1° 147.102
7 Jan 2010 08:05 16:09 8h 04m 33s + 1m 40s 12:07 16.2° 147.105
8 Jan 2010 08:04 16:10 8h 06m 19s + 1m 46s 12:07 16.3° 147.110
9 Jan 2010 08:04 16:12 8h 08m 11s + 1m 51s 12:08 16.5° 147.115
10 Jan 2010 08:03 16:13 8h 10m 07s + 1m 56s 12:08 16.6° 147.120
11 Jan 2010 08:02 16:15 8h 12m 09s + 2m 01s 12:08 16.8° 147.127
12 Jan 2010 08:02 16:16 8h 14m 16s + 2m 06s 12:09 16.9° 147.134
13 Jan 2010 08:01 16:18 8h 16m 28s + 2m 11s 12:09 17.1° 147.141
14 Jan 2010 08:00 16:19 8h 18m 45s + 2m 16s 12:10 17.3° 147.149
15 Jan 2010 08:00 16:21 8h 21m 06s + 2m 20s 12:10 17.5° 147.158
16 Jan 2010 07:59 16:22 8h 23m 32s + 2m 25s 12:10 17.6° 147.167
17 Jan 2010 07:58 16:24 8h 26m 01s + 2m 29s 12:11 17.8° 147.177
18 Jan 2010 07:57 16:25 8h 28m 35s + 2m 33s 12:11 18.0° 147.187
19 Jan 2010 07:56 16:27 8h 31m 14s + 2m 38s 12:11 18.3° 147.198
20 Jan 2010 07:55 16:29 8h 33m 56s + 2m 42s 12:11 18.5° 147.209
21 Jan 2010 07:54 16:30 8h 36m 42s + 2m 45s 12:12 18.7° 147.221
22 Jan 2010 07:53 16:32 8h 39m 32s + 2m 49s 12:12 18.9° 147.234
23 Jan 2010 07:51 16:34 8h 42m 25s + 2m 53s 12:12 19.1° 147.248
24 Jan 2010 07:50 16:35 8h 45m 21s + 2m 56s 12:13 19.4° 147.262
25 Jan 2010 07:49 16:37 8h 48m 21s + 2m 59s 12:13 19.6° 147.277
26 Jan 2010 07:48 16:39 8h 51m 24s + 3m 03s 12:13 19.9° 147.293
27 Jan 2010 07:46 16:41 8h 54m 30s + 3m 06s 12:13 20.1° 147.309
28 Jan 2010 07:45 16:43 8h 57m 39s + 3m 08s 12:13 20.4° 147.327
29 Jan 2010 07:43 16:44 9h 00m 51s + 3m 11s 12:14 20.7° 147.345
30 Jan 2010 07:42 16:46 9h 04m 05s + 3m 14s 12:14 20.9° 147.364
31 Jan 2010 07:41 16:48 9h 07m 22s + 3m 16s 12:14 21.2° 147.385
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Report positively4thsteet January 1, 2010 3:28 PM GMT
wrong forum muppet
Report MrNibbs January 1, 2010 3:54 PM GMT
Where did you get all that from?!
Report Lies, DamnLies, and Statistics January 1, 2010 3:55 PM GMT
where is the geography forum??
Report I win every time! January 1, 2010 4:08 PM GMT
Classic. I love the BF forum! Good post - roll on summer!!!
Report positively4thsteet January 1, 2010 4:17 PM GMT
I feel the same on 23 January - Winter's on its way, the nights are drawing in.
Report positively4thsteet January 1, 2010 4:18 PM GMT
I men 23 June. ffs, I'm not doing very well here.
Report I win every time! January 1, 2010 4:21 PM GMT
Does the rate of increase (in daylight) really shorten after the Spring equinox?
Report positively4thsteet January 1, 2010 4:48 PM GMT
Yep. It is "sinusoidal". Not sure if you know what that means. But yes the equinox(ii ?) are the two points of maximum change. The differnce between say 21 June and 22 June is a few seconds. at the equinoxii the difference is 4 minutes.
Report STEPTOES YARD January 1, 2010 4:53 PM GMT
Can you post up the feb and march charts on here mate
Report positively4thsteet January 1, 2010 4:57 PM GMT
they're onchitchat
Report aston January 1, 2010 11:01 PM GMT
Are you sure you have the correct figures? how can it be that the sunset is changing faster than the sunrise? You have the sunset 46 minutes later on the 31st of january compared to the 1st and the sunrise only gets 26 minutes earlier. Surely they must be the same mustnt they?
Report crunchyfrog January 2, 2010 1:25 PM GMT
aston, it is because the sunrise and sunset sinusoids are not exactly out of phase. The sunrise sinusoid is at a maximum about a week after the shortest day, yet the sunset sinusoid is at a minimum about a week before the shortest day. The sun starts to set at a later time well before it starts rising at an earlier time. Hence the rates of change are different, as they are on a different part of the curve. It's all down to the tilt of the earth's axis, and the ellipticity of the earth's orbit. :-)
Report oneputt January 2, 2010 1:33 PM GMT
tee off a few minutes later every day - soon back to 36 in a day
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