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Thread: Venus magnitude -4.0
Post: RE: Venus magnitud -4.0
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CelNav57 Wrote: (02-29-2016, 12:47 PM)
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jeremyparker Wrote: (02-29-2016, 12:05 PM)
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PS - apologies for the asterisk - I'm not sure where to find a degree symbol on this keyboard!
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Welcome ... |
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stargazer |
The Sight Reduction process
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21,314 |
02-29-2016, 02:41 PM |
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Thread: Altitude correction, Sun, with reflecting artificial horizon
Post: Altitude correction, Sun, with reflecting artifici...
| The sun has a large apparent disc covering a big area. The lower limb has more atmospheric refractive bending than the upper limb. By the way, the bent light makes it look high, just like shooting at ... |
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stargazer |
General Topics Here
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24,308 |
01-05-2016, 01:46 AM |
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Thread: shooting a star
Post: RE: shooting a star
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Lipr Wrote: (12-24-2015, 04:27 PM)
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I'll bet the CG sextant, even though you were young, was a bronze framed one.
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Even though I'm old, I'm pretty sure when I was young it was after the "Bronze... |
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stargazer |
The Sight Reduction process
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14,510 |
12-27-2015, 01:09 PM |
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Thread: shooting a star
Post: RE: shooting a star
| Thank you Lipr, excellent explanation! I like the counting and the support line. Starting the stop watch is a good idea, if you can hold both items and keep a thumb on the button. I hadn't thought of ... |
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stargazer |
The Sight Reduction process
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14,510 |
12-24-2015, 03:00 PM |
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Thread: shooting a star
Post: shooting a star
| Here is something I remembered that may or may not be helpful.
When I was about ten years old I purchased a very cheap plastic sextant. I could never understand the "grownup" directions that came w... |
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stargazer |
The Sight Reduction process
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14,510 |
12-24-2015, 02:24 AM |
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Thread: Venus magnitude -4.0
Post: RE: Venus magnitud -4.0
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Fred_B Wrote: (12-18-2015, 02:03 AM)
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Have been trying to shoot Venus but it has been too cloudy. When you want to shoot a planet or a star and are excited to do it the wx often gets bad.
Did... |
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stargazer |
The Sight Reduction process
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11 |
21,314 |
12-18-2015, 12:07 PM |
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Thread: Venus magnitude -4.0
Post: RE: Venus magnitud -4.0
| Hi Fred,
Thanks, that makes sense.
Quote:
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"V technically should not stand for velocity, since velocity means both speed and direction"...
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Got that part right! :-)
Guess I described w... |
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stargazer |
The Sight Reduction process
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11 |
21,314 |
12-17-2015, 11:26 PM |
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Thread: Venus magnitude -4.0
Post: RE: Venus magnitud -4.0
| I'm relatively ignorant about celestial navigation but I understand the major motions of the celestial bodies fairly well. So here is my best guess of what the V in the correction tables stands for.... |
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stargazer |
The Sight Reduction process
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11 |
21,314 |
12-17-2015, 04:00 PM |
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Thread: Cleaning shades and mirror?
Post: RE: Cleaning shades and mirror?
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C_Davidson Wrote: (12-16-2015, 01:26 AM)
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That was an interesting from your youth up- you've lived the name you use. You father did make a wise decision.
Will take your advice about the cotton ... |
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stargazer |
General Topics Here
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16,568 |
12-16-2015, 02:13 AM |
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Thread: Cleaning shades and mirror?
Post: RE: Cleaning shades and mirror?
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C_Davidson Wrote: (12-15-2015, 10:14 PM)
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Does your name "stargazer" rightly mean you are an astronomer?
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Amateur only, since a child. I can actually still remember the first time I saw the star... |
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stargazer |
General Topics Here
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16,568 |
12-16-2015, 01:10 AM |
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Thread: Cleaning shades and mirror?
Post: RE: Cleaning shades and mirror?
| I'm not experienced cleaning a sextant, but I have cleaned front surfaced (delicate) telescope mirrors, one worth $$$. I used distilled water, one drop of Dawn detergent in a gal of distilled. I first... |
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stargazer |
General Topics Here
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6 |
16,568 |
12-15-2015, 03:49 PM |
