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The Sundial Cannon of Åtvidaberg (2017)

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71 points choult | 6 comments | 15 Oct 24 18:28 UTC | HN request time: 0.622s | source | bottom
1. Animats ◴[15 Oct 24 20:54 UTC] No.41853000[source]▶
"The 6-pound cannon is fired everyday at 1 PM, from May to September."

Not at local noon?

replies(5): >>41853219 #>>41853354 #>>41854790 #>>41856100 #>>41856802 #
2. p_l ◴[15 Oct 24 21:16 UTC] No.41853219[source]▶
For navigational purposes you want your "noon" to be aligned with a known datum, and that often was Greenwich meridian.
3. impossiblefork ◴[15 Oct 24 21:34 UTC] No.41853354[source]▶
Sweden user summer time, so we get up earlier during the bright part of the year.

So it's still local noon.

4. ahazred8ta ◴[16 Oct 24 01:33 UTC] No.41854790[source]▶
At 12:00, the calibration people were busy nailing down the time, so the public sync signal was given at 1.
5. kzrdude ◴[16 Oct 24 06:15 UTC] No.41856100[source]▶
During summer, the peak sun altitude is at 1 pm (approximately) which makes it noon.
6. rob74 ◴[16 Oct 24 08:22 UTC] No.41856802[source]▶
Before they introduced Daylight Saving Time, it was probably at local noon. It would be at local noon if it were fired between October and March, but it's only May to September, so...