please empty your brain below
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Omg. A photo of the elusive DG. Or at least his shadow.
I might make an analemmatic sundial to pass the time in lockdown
Ian | 15.04.20 - 7:40 a.m. | #
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..and I hope you hummed 'Me and My Shadow' while performing this important scientific experiment.
PJS | 15.04.20 - 8:08 a.m. | #
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Cue various DG readers looking for subtle clues to help them recognise DG from his shadow.
Andrew S | 15.04.20 - 8:52 a.m. | #
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Are there simple instructions for making one's own analemmatic sundial? I have the perfect place to put one...
dg writes: Try here, here, here or here.
Blue Witch | Homepage | 15.04.20 - 9:12 a.m. | #
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I did say simple! Will you come and set it up for me, please?
Blue Witch | Homepage | 15.04.20 - 9:38 a.m. | #
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The key thing is to get the ellipse right.
Align the short axis North-South and the long axis East-West.
To match your latitude, the long axis needs to be 22% longer than the short axis.
diamond geezer | Homepage | 15.04.20 - 9:48 a.m. | #
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You being unemployed is a terrible waste of a good mind.
Thanks for all the stuff.
Joho | Homepage | 15.04.20 - 9:55 a.m. | #
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Yeah, that will fit the space well. You didn't answer my question ;)
Blue Witch | Homepage | 15.04.20 - 10:03 a.m. | #
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There is a similar analemmatic sundial on a wall in Paternoster Square. I often wondered how it worked, thanks for the explanation.
Sara | 15.04.20 - 10:10 a.m. | #
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Hmmm, you've got me wondering if I can cram a sundial onto my southeast facing back wall, especially as the hands on the clock out there just dangle uselessly at the half hour even when the battery is actually working!
Cornish Cockney | 15.04.20 - 10:41 a.m. | #
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Another variable is how sunny or overcast it is on each of those dates.
I wonder how this affects the chances of being able to read a sundial on any of the four accurate dates.
Anon | 15.04.20 - 11:10 a.m. | #
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In London the average 15th April has about 5½ hours of sunshine.
That's out of 14 hours of daylight, so a sundial might be readable 40% of the time.
For the full list of dates...
15th April: 5½ hours out of 14 (=40%)
13th June: 6½ hours out of 16½ (=40%)
1st September: 4½ hours out of 13½ (=33%)
25th December: 2 hours out of 8 (=25%)
diamond geezer | Homepage | 15.04.20 - 11:34 a.m. | #
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Looks from the shadow like DG carries a staff. I imagine a Gandalf like figure making his way daily through the Olympic Park. Five rings to rule them all.
NPIan | 15.04.20 - 12:36 p.m. | #
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DG being employed would be a waste of a good mind. Unless he was paid to write interesting blogs (and the occasional "rant")
dg writes: think before you type, John.
John | 15.04.20 - 5:41 p.m. | #
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The shadow of DG - not so much Gandalf, maybe more like The Grim Reaper.
When we're all allowed out again, I think we should be aware of a man with a scythe, on a bus, making notes! 😂
Jo W | 15.04.20 - 6:21 p.m. | #
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One thing to note is that the actual dates vary by +- 1 day due to the insertion of leap days to keep our calendar in step with the Earth's rotation about the Sun. This is also why the dates of the Winter & Summer solstices and the equinoxes vary by +- one day. The millennium correction of missing the leap day also impacts the actual dates of these events.
dg writes: (as I noted in the grey text at the bottom).
JohnM | 17.04.20 - 6:24 p.m. | #
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