Hello nuns, monks and all astrophiles here around!

We were sitting looking the sunset at beer o'clock, the fat old Sun submerging into the Tyerrenian Sea.. yeah! not that bad :)

Then she noticed how fast the daylight hours were shortening at our current 41.45°N latitude but also said that at higher latitudes, for example at 53.07°N the shortening is faster being the sunset ~2.5minutes earlier every day while in the South at 41.45°N is ~1.5minutes earlier in August (the difference for dawns is shorter but still aprreciable... why it is shorter?).

Then she infered (why dont you have to desume in English?) that, given the faster shortening in the North than in the South, there must be one day (..well probably two) when they meet and because of this it should be one day with the same amount of daylights hours at 41.45°N and 53.07°N not at the same time but in the same day of the year an equal daylight duration.

By other hand I was arguing that this is impossible and only points at the same latitude can have the same daylight hours in the same day of the year. More: the above reasoning should also be true for very distant points like Tropico and Polar Crown (at least) and this seems to me unreasonalbe.

If she is right then given the distance between two latitudes should be possible to calculate this phantomatic day of the year at least its distance in days from Solstice.. mumble mumble..

[Q] who is right? And how to explain the reason in a clean, layman way?

L*

There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

In reply to [OT] Astronomical puzzling about daylight hours at different latitudes by Discipulus

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