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07/21/2009 07:55:36 PM · #1 |
| Is it just before or after or somewhat after sunset? So if my sunset tomorrow is supposed to be about 9:04pm when would you expect dusk to fall? |
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07/21/2009 08:01:37 PM · #2 |
"The darker stage of twilight"; "dusk" originally "dark";
Ergo, to answer your question, likely somewhat after sunset. I wouldn't look at my watch but at the light.
It may be sunset here and dusk 500 ft north of here... |
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07/21/2009 08:01:49 PM · #3 |
After the sunset as it starts getting dark.
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07/21/2009 08:04:12 PM · #4 |
If you go to the weather underground, type in your zip code in the top leftish, then scroll down to "astronomy" toward the left side, it gives you sunrise and set, civil, nautical and astronomical twilight. That should give you a good idea, at least.
eta; of course your terrain will make a difference. If you're in the shadow of a hill it's gonna get dark a lot sooner :)
Message edited by author 2009-07-21 20:05:06. |
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07/21/2009 08:06:50 PM · #5 |
calsky
Click on calendar, after setting up your location. Select sun and moon under recurring events. You'll see dusk for your location.
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07/21/2009 08:13:14 PM · #6 |
| thanks all I guess I could pay attention tonight too.......not too many mt's live in northern MN but we do have some tall tall trees =0) |
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07/21/2009 08:19:13 PM · #7 |
| Just look around for vampires. If you see any, it's dusk. |
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07/21/2009 08:44:59 PM · #8 |
| in the past month we have killed because this is an ongoing problem for years and have tried many different things.....40 bats IN OUR HOUSe............so the thought of a vampire is not that far off..........lol so when I see the bats flying that would also be considered dusk? |
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07/21/2009 08:50:14 PM · #9 |
Originally posted by Pikkel:
in the past month we have killed because this is an ongoing problem for years and have tried many different things.....40 bats IN OUR HOUSe............so the thought of a vampire is not that far off..........lol so when I see the bats flying that would also be considered dusk? |
Not unless they transform, or are seen reading "Twilight" |
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07/21/2009 10:56:57 PM · #10 |
"Dusk" is a subdivision of twilight, the darker part. "Twilight" is the time between sunset and absolute darkness, or between absolute darkness and sunrise. "Nautical twilight" is the last (or first) visibility of the horizon at sea, and represents the beginning (or the end) of darkness, so nautical twilight basically is the very end (or the beginning) of dusk. It's all subjective, though. These aren't precisely defined terms.
For what it's worth, bats fly around at dusk for sure :-)
R.
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07/21/2009 11:02:44 PM · #11 |
Actually Robert, *ahem*, they are precisely defined terms. Civil twilight is from sunset to when the sun is six degrees below the horizon. Nautical twilight begins when the sun is six degrees below the horizon. Astronomical twilight begins at the end of nautical twilight when the sun is twelve degrees below the horizon. Darkness begins at the end of Astronomical twilight when the sun is eighteen degrees below the horizon.
You can use programs like Stellarium or The Photographer's Ephemeris to see when various twilights begin where you are. I have found that interesting colors in the sky can be had by shooting at the beginning of astronomical twilight while still having a lot of stars in the sky. Here's an example (to the naked eye the sky is already seen as "black"):
Message edited by author 2009-07-21 23:03:53. |
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07/21/2009 11:09:26 PM · #12 |
Originally posted by DrAchoo:
Actually Robert, *ahem*, they are precisely defined terms. Civil twilight is from sunset to when the sun is six degrees below the horizon. Nautical twilight begins when the sun is six degrees below the horizon. Astronomical twilight begins at the end of nautical twilight when the sun is twelve degrees below the horizon. Darkness begins at the end of Astronomical twilight when the sun is eighteen degrees below the horizon.
You can use programs like Stellarium or The Photographer's Ephemeris to see when various twilights begin where you are. I have found that interesting colors in the sky can be had by shooting at the beginning of astronomical twilight while still having a lot of stars in the sky. Here's an example (to the naked eye the sky is already seen as "black"):
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Well, yeah, I guess in that sense they are, but I was speaking more colloquially; the terms get bandied around a lot, among sailors especially, and are kind of fluid. But you're absolutely correct, of course, in that civil, nautical, and astronomical twilight all have precise meanings in almanacs and in the ephemeris.
R. |
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07/22/2009 12:11:12 AM · #13 |
| Just bustin' your chops because you're so smart... |
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07/22/2009 12:17:05 AM · #14 |
Originally posted by DrAchoo:
Just bustin' your chops because you're so smart... |
Neither of you are that smart if you're out at dusk, risking vampire attacks. |
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07/22/2009 12:24:02 AM · #15 |
Originally posted by DrAchoo:
I have found that interesting colors in the sky can be had by shooting at the beginning of astronomical twilight while still having a lot of stars in the sky. |
Before you look, guess what camera I used to capture this. That's Venus shining out of the upper part, and you can make out the San Francisco Bay waters in front of Mt. Tamalpais near the bottom.
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