Tea? (Part 2)
- Thread starter LordoftheTeapot
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ColinJ
Puzzle game procrastinator!
- Location
- Todmorden - Yorks/Lancs border
You can add extra columns to the calculator for twilight rise/set.Thankyou Colin.Yes, I found that website for the sunset and sunrise times, but it does not say how long it takes to get dark.
ColinJ
Puzzle game procrastinator!
- Location
- Todmorden - Yorks/Lancs border
Various terms:
Astronomical Twilight Starts/Ends
Astronomical twilight is the period when the center of the Sun is between 12 and 18 degrees below the horizon. It starts at astronomical dawn, early in the morning when the Sun is higher than 18 degrees below the horizon. From this point, it will be difficult to observe certain faint stars, galaxies, and other objects because the Sun starts to illuminate the sky. Astronomical twilight ends at astronomical dusk in the late evening, when those faint objects again can be visible because the Sun is lower than 18 degrees below the horizon. In locations north of 48°24' N or south of 48°24', it never gets darker than this near the middle of the summer solstice (June or December).
Technically, the start and end times are when the true geocentric position of the Sun is 108 degrees from the zenith position, or directly above the observer.
Astronomical twilight is the period when the center of the Sun is between 12 and 18 degrees below the horizon.
Nautical Twilight Starts/Ends
Nautical twilight is the period when the center of the Sun is between 6 and 12 degrees below the horizon, when bright stars are still visible in clear weather and the horizon is becoming visible. It is too dark to do outdoor activities without additional lighting.
Nautical twilight starts at nautical dawn, at 12 degrees below the horizon, and nautical twilight ends at nautical dusk, when the Sun is lower than 12 degrees below the horizon. For locations north of 54°34' N or south of 54°34' S latitude, the Sun will never be lower than 12 degrees below the horizon for a period in the summer.
Technically, the start and end times are when the true geocentric position of the Sun is 102 degrees from the zenith position.
Civil Twilight Starts/Ends
Civil twilight is the period when the Sun is below the horizon but its center is less than 6 degrees below. The "Civil Twilight Starts" time is the dawn or civil dawn, with the center of the Sun at exactly 6 degrees below the horizon. Equally, the "Civil Twilight Ends" time is dusk or civil dusk, when the Sun is 6 degrees below the horizon in the evening.
During civil twilight, the sky is still illuminated, and with clear weather it is brightest in the direction of the Sun. The Moon and the brightest stars and planets may be visible. It is usually bright enough for outdoor activities without additional lighting.
Astronomical Twilight Starts/Ends
Astronomical twilight is the period when the center of the Sun is between 12 and 18 degrees below the horizon. It starts at astronomical dawn, early in the morning when the Sun is higher than 18 degrees below the horizon. From this point, it will be difficult to observe certain faint stars, galaxies, and other objects because the Sun starts to illuminate the sky. Astronomical twilight ends at astronomical dusk in the late evening, when those faint objects again can be visible because the Sun is lower than 18 degrees below the horizon. In locations north of 48°24' N or south of 48°24', it never gets darker than this near the middle of the summer solstice (June or December).
Technically, the start and end times are when the true geocentric position of the Sun is 108 degrees from the zenith position, or directly above the observer.
Astronomical twilight is the period when the center of the Sun is between 12 and 18 degrees below the horizon.
Nautical Twilight Starts/Ends
Nautical twilight is the period when the center of the Sun is between 6 and 12 degrees below the horizon, when bright stars are still visible in clear weather and the horizon is becoming visible. It is too dark to do outdoor activities without additional lighting.
Nautical twilight starts at nautical dawn, at 12 degrees below the horizon, and nautical twilight ends at nautical dusk, when the Sun is lower than 12 degrees below the horizon. For locations north of 54°34' N or south of 54°34' S latitude, the Sun will never be lower than 12 degrees below the horizon for a period in the summer.
Technically, the start and end times are when the true geocentric position of the Sun is 102 degrees from the zenith position.
Civil Twilight Starts/Ends
Civil twilight is the period when the Sun is below the horizon but its center is less than 6 degrees below. The "Civil Twilight Starts" time is the dawn or civil dawn, with the center of the Sun at exactly 6 degrees below the horizon. Equally, the "Civil Twilight Ends" time is dusk or civil dusk, when the Sun is 6 degrees below the horizon in the evening.
During civil twilight, the sky is still illuminated, and with clear weather it is brightest in the direction of the Sun. The Moon and the brightest stars and planets may be visible. It is usually bright enough for outdoor activities without additional lighting.
Hill Wimp
Fair weathered,fair minded but easily persuaded.
Puddles
Do I need to get the spray plaster out?
- Location
- Hamble, Southampton
- Location
- Next door to Mr Benn at No 54
Who knows someone on this thread who has been to Kilimanjaro recently? 
phil_hg_uk
I am not a member, I am a free man !!!!!!
classic33
Leg End Member
Was I wrong about the rain this morning ?No...I think that we'll have an Indian summer lasting 'till December this year. So you should be OK (ps I don't care what Classic says....he's wrong)
Hill Wimp
Fair weathered,fair minded but easily persuaded.
classic33
Leg End Member
What've you done wrong now'!!
Hill Wimp
Fair weathered,fair minded but easily persuaded.
If there is snow on the ground I am happy to observe from within my lounge.Erm
Hill Wimp
Fair weathered,fair minded but easily persuaded.
Nothing........ yet
I'm just saying after yours and Colins help with my photos earlier this week and Colins post on sunsets,I have learnt a lot
Hill Wimp
Fair weathered,fair minded but easily persuaded.
@thegreenmanWho knows someone on this thread who has been to Kilimanjaro recently?
Hill Wimp
Fair weathered,fair minded but easily persuaded.
Plenty of time for a cocktail see
classic33
Leg End Member
He's wearing a coat though, that does'nt count. Further doubts cast!No Gloves
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