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02/20/2008 04:23:01 PM · #126 |
Originally posted by GeneralE:
Originally posted by DrAchoo:
If I read Stellarium and Google Earth correctly, I should be able to catch the whole thing from this vantage. |
Great-looking location -- I have a hard time getting a clear view of the eastern horizon. Moonrise on the West Coast is 5:45, so I think the Moon will only be about 15° above the horizon at the onset of totality. |
Ya, that should be about right. It looks like it will start about 12 degrees north of east right at the horizon at 5:45 and then end about 35 degrees high and 20 degrees south of east. I wish I knew how high those mountains were in degrees because my guess is 10 degrees north of east is probably above where that tiny island is in the river. The hills there will be in the way of the beginning.
Anybody know the easiest way to figure out their height in degrees? I could probably find their elevation from a topo map somewhere.
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02/20/2008 04:25:29 PM · #127 |
| I have my telescope set up at the window. Just cleaned the mirrors, The sky is about as clear as it can be. I am ready to enjoy the view. Just wish my neighbors didn't have those big trees in my path. |
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02/20/2008 04:26:39 PM · #128 |
| Bollocks, clouded out here :-( |
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02/20/2008 04:33:13 PM · #129 |
Ok, who wants to do the math?
I will be at 800 ft elevation. The hill top is 2400 ft and is roughly 5 miles away. How high will that appear in degrees in the sky?
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02/20/2008 04:33:48 PM · #130 |
Originally posted by DrAchoo:
Anybody know the easiest way to figure out their height in degrees? I could probably find their elevation from a topo map somewhere. |
I think you need to know how far away you are from that point to have two legs of the triangle -- then it's a matter of scale. But I quit trigonometry in high school (long story) so I forget the exact formulas needed.
That's about an 11:1 slope ... so ... 1/11 of 45° or about 4° maybe?
Message edited by author 2008-02-20 16:38:13. |
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02/20/2008 04:41:40 PM · #131 |
Originally posted by GeneralE:
Originally posted by DrAchoo:
Anybody know the easiest way to figure out their height in degrees? I could probably find their elevation from a topo map somewhere. |
I think you need to know how far away you are from that point to have two legs of the triangle -- then it's a matter of scale. But I quit trigonometry in high school (long story) so I forget the exact formulas needed.
That's about an 11:1 slope ... so ... 1/11 of 45° or about 4° maybe? |
inverse tangent of 2400/26400
5.19 degrees I believe
ETA: but if you want the degrees from a level line at 800 feet, it would be about 1.30 3.46 degrees
inv tan of (2400-800)/26400
Message edited by author 2008-02-20 17:22:25. |
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02/20/2008 04:44:31 PM · #132 |
Originally posted by DrAchoo:
Ok, who wants to do the math?
I will be at 800 ft elevation. The hill top is 2400 ft and is roughly 5 miles away. How high will that appear in degrees in the sky? |
 kirbic does those kinds of calculations in his head while pounding on forum stormers and eating breakfast.
Seat of the pats calculation, no more than a few degrees. Will be a decent horizon.
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02/20/2008 04:45:21 PM · #133 |
Thanks guys. it looks like the moon will be 5 degrees above the horizon at about 6:11 so I shouldn't miss too much.
There's a lot of work that goes into making sure you are in the right place at the right time. :) I'm planning on shooting the moon with the 300mm (couldn't find a 1.4TC), but will also shoot some landscapes and then collage the moon into the landscape at appropriate position and size later. We'll see how it turns out.
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02/20/2008 04:46:54 PM · #134 |
'sposed to be cloudy here tonight. actually, it's pretty darn cloudy right now.
:( |
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02/20/2008 04:47:10 PM · #135 |
Did someone say breakfast?
That will certainly grab Kirbics attention.
Originally posted by strangeghost:
Originally posted by DrAchoo:
Ok, who wants to do the math?
I will be at 800 ft elevation. The hill top is 2400 ft and is roughly 5 miles away. How high will that appear in degrees in the sky? |
kirbic does those kinds of calculations in his head while pounding on forum stormers and eating breakfast.
Seat of the pats calculation, no more than a few degrees. Will be a decent horizon. |
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02/20/2008 04:48:19 PM · #136 |
Originally posted by strangeghost:
Originally posted by DrAchoo:
Ok, who wants to do the math?
I will be at 800 ft elevation. The hill top is 2400 ft and is roughly 5 miles away. How high will that appear in degrees in the sky? |
kirbic does those kinds of calculations in his head while pounding on forum stormers and eating breakfast.
Seat of the pats calculation, no more than a few degrees. Will be a decent horizon. |
3.46 degrees, approximately of course! |
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02/20/2008 04:50:53 PM · #137 |
Originally posted by oscarthepig:
inverse tangent of 2400/26400 |
Stuff like "inverse tangent" is why I quit Trig ... ;-)
My estimate was pretty close though ... |
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02/20/2008 04:52:58 PM · #138 |
Originally posted by GeneralE:
Originally posted by oscarthepig:
inverse tangent of 2400/26400 |
Stuff like "inverse tangent" is why I quit Trig ... ;-)
My estimate was pretty close though ... |
It's handy stuff though. I'd venture to guess I've used it more in my life than I ever did in Trig. class.
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02/20/2008 04:54:14 PM · #139 |
Originally posted by brownsm:
Originally posted by strangeghost:
Originally posted by DrAchoo:
Ok, who wants to do the math?
I will be at 800 ft elevation. The hill top is 2400 ft and is roughly 5 miles away. How high will that appear in degrees in the sky? |
kirbic does those kinds of calculations in his head while pounding on forum stormers and eating breakfast.
Seat of the pats calculation, no more than a few degrees. Will be a decent horizon. |
3.46 degrees, approximately of course! |
Was that a guesstimate or a calculation? I'd like to know how you arrived at that figure (in case my method was wrong). |
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02/20/2008 04:56:29 PM · #140 |
Originally posted by GeneralE:
Originally posted by hajeka:
It's not so very cold here, but I don't think the clouds will cooperate. Besides that, it's in the middle of the night and we had a lunar eclipse less than a year ago. |
This is the last (total) lunar eclipse until December, 2010. |
Seems I'll have to wait until September 28, 2015 for a situation like this (in 2010 the moon will be too low here). Just looked outside (moon is visible) and at the weather forecast (clouds are coming very (too) soon), so I'll have to do it with this thread. |
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02/20/2008 05:11:39 PM · #141 |
Originally posted by oscarthepig:
Originally posted by brownsm:
Originally posted by strangeghost:
Originally posted by DrAchoo:
Ok, who wants to do the math?
I will be at 800 ft elevation. The hill top is 2400 ft and is roughly 5 miles away. How high will that appear in degrees in the sky? |
kirbic does those kinds of calculations in his head while pounding on forum stormers and eating breakfast.
Seat of the pats calculation, no more than a few degrees. Will be a decent horizon. |
3.46 degrees, approximately of course! |
Was that a guesstimate or a calculation? I'd like to know how you arrived at that figure (in case my method was wrong). |
calculation. your method was right. inverse tangent of (1600/26400). |
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02/20/2008 05:12:48 PM · #142 |
Originally posted by oscarthepig:
Originally posted by GeneralE:
Originally posted by oscarthepig:
inverse tangent of 2400/26400 |
Stuff like "inverse tangent" is why I quit Trig ... ;-)
My estimate was pretty close though ... |
It's handy stuff though. I'd venture to guess I've used it more in my life than I ever did in Trig. class. |
I agree. used trig to figure out if I could get satellite TV, and to figure out how tall that tree I was about to cut down was (and would it hit the house!) |
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02/20/2008 05:14:50 PM · #143 |
Originally posted by brownsm:
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calculation. your method was right. inverse tangent of (1600/26400). [/quote]
Ooops. I must have keyed it in wrong to end up with 1.30 degrees. Thanks! I'm so careless. lol |
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02/20/2008 05:21:23 PM · #144 |
Originally posted by brownsm:
I agree. used trig ... to figure out how tall that tree I was about to cut down was (and would it hit the house!) |
Oh my! I know people who wouldn't have even considered the tree's height before chopping...lol |
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02/20/2008 05:25:40 PM · #145 |
Originally posted by oscarthepig:
It's handy stuff though. I'd venture to guess I've used it more in my life than I ever did in Trig. class. |
Oh course -- that's what's so frustrating. Yet another thing to add to the list of "If only I'd known this when I was ..." items.
And I think my method was right too, even if I wasn't using the names for the procedures -- and even with forgetting to subtract the viewer's elevation and estimating the other values, 4 is close enough to 3.46 for me ... :-)
Message edited by author 2008-02-20 17:27:04. |
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02/20/2008 05:30:32 PM · #146 |
Originally posted by GeneralE:
... 4 is close enough to 3.46 for me ... :-) |
Very true. It's unlikely that anyone would be trying to position their camera with such accuracy anyway. Us computer geeks get hung up on (overly) accurate numbers sometimes :) |
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02/20/2008 05:49:19 PM · #147 |
Tonight: Cloudy intervals. Low 21F. Winds NE at 5 to 10 mph.
Maybe I'll get to shoot it after all...it's not looking too bad out there right now! :) |
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02/20/2008 07:17:01 PM · #148 |
Originally posted by oscarthepig:
Tonight: Cloudy intervals. Low 21F. Winds NE at 5 to 10 mph.
Maybe I'll get to shoot it after all...it's not looking too bad out there right now! :) |
Hmph. Low of -14F (-26C) here tonight. I'll be running out and running in. Brrr... |
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02/20/2008 07:54:50 PM · #149 |
D100 & 24mm .. one frame a minute for the next 4hours (or so )
unless someone steals the rig
2gig card will hold 602 images
taken some full moon pics with the D200 & 1000mm..
keeping that set up in the garage to it doesn't condense ..
will go out periodically...
hope to get a montage out of it |
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02/20/2008 08:15:12 PM · #150 |
Weather is good in South Florida. It's clear with a few wispy clouds at this time, and about 74 F and calm out. I plan to get to a dark quiet place and shoot a few at it after I eat. I have the location picked out and things are ready to go.
We heard the sonic boom from the space shuttle coming over on its way to land this morning, so today is going to be a spacey kind of day.
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