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Dug this out of my notes...

Civil twilight: when the Sun is less than 6° below the horizon.

Nautical twilight: when the Sun is 12° to 6° below the horizon.

Astronomical twilight: when the Sun is 18° to 12° below the horizon.

Night: when the Sun is more than 18° below the horizon.

:grin:

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At our latitude we don't get astronomical twilight at all between the start of May and August so it's a bit of a holiday from practical astronomy :grin:

I'm filling my time trying to plough through Brian Greene's "The Elegant Universe"

Roll on August :lol:

Paul

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At our latitude we don't get astronomical twilight at all between the start of May and August so it's a bit of a holiday from practical astronomy :grin:

I'm filling my time trying to plough through Brian Greene's "The Elegant Universe"

Roll on August :lol:

Paul

Spooky...I'm reading that myself at the moment!

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btw theres a wee program call NightCal which is good for seeing what phase the moon is, rise and set times, astronomical twilight times etc for your location.

http://nightcal.mysite.wanadoo-members.co.uk/

Thanks for that :thumbright:

I've got to wait till 25th July for it to get properly dark again...

This will happen at 00:45

Can I work out how long the darkness will last?

Cheers

Jon

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Fabric of the Cosmos by Brian Greene is another excellent book to waste those daylight hours.

I'm half way through that at the moment. Not exactly light reading is it...............

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