Sunrise to sunset...
I always know the exact sunrise and sunset times to the second for where I am at any particular time.

I've got charts printed out and spreadsheets ready on my computer so that I'm always one step ahead of that sun thing. He thinks he's so big with his hydrogen and fusion and stuff.

Sunrise tomorrow at 5:01:24 BST. Sunset at 21:34:16 BST. 1 minute 36 seconds less sunlight than yesterday; sunrise 57 seconds and sunset 39 seconds later than yesterday.
(Dai Napoleon, Wed 7 Jul 2010, 2:56, 5 replies)

if you want to take it a step further
My basic-model handheld GPS will display local sunrise / sunset times, which should let you correct for your movement on-the-fly over the course of the day; for example if you were travelling but didn't know your route. After all, not everyone will be in the same place during a given days sunrise and sunset.

I have to say, though; I've never really tested the readings mine gives. There's at least three different definitions of dawn, and I don't know which Garmin uses*. Also, I don't know if it factors in user altitude; if you started your day on the coast, but finished camping 1000ft above MSL, I expect your daylight would seem a little longer than if you stayed low.

Without me taking it outside to sync up; it says sunrise is 04:41 and sunset 21:50 for its most recent nav fix (a lovely visit to NY 519 787 , 55ᵒ06'04.2" by 002ᵒ45'11.74" ).

* I love the expression "Civil Dawn". It conjures up images of the sun going "I say, chaps; would you mind awfully if I just shone here a little? I'll be out your way in no time. Thanking you so much!"
(The Incredible Sulk Finally remembered his password on, Wed 7 Jul 2010, 6:20, closed)

isn't it sunset 39 seconds earlier?
( insignificantsnivellinglittleturd I Like Peas, Wed 7 Jul 2010, 10:45, closed)

Why?
Are you a vampire?
( shinyshinyscalp less a man, more a way of life, Wed 7 Jul 2010, 12:10, closed)

I'd have to get up very early in the morning to catch you out

(TheManWithThePlan cussed your mum on, Wed 7 Jul 2010, 14:11, closed)

I'm with you!
I have spreadsheets on the desktops of my home and work computers with the sunrise and sunset details (and more besides, eg. length of day, solar noon, azimuth etc.)

Largely thanks to

www.timeanddate.com/

It came about because I suffer from SAD and so in the depths of winter it's nice to know that the days start getting longer at the end of December.

Though now of course they are slowly, gradually - but surely - getting shorter :(

Dr S
(Dr Skagra glorious glargzhem, Wed 7 Jul 2010, 15:23, closed)