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Why is moon not full all the time in the night sky

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The sun lights up half of the moon. Depending on where the moon is in its orbit around the earth, we see anywhere from all of the lit half (full moon) to none of it (new moon).

See http://en.wikipedia.org/wiki/Lunar_phase

Posted on Dec 21, 2013

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Cannot see anything thru telescope even daytime


  1. Get Stellarium or another fine astronomy program
  2. During the day, point the telescope at a part of the landscape about 100 yards away.
  3. Use the lowest power eyepiece (highest number) in the focal tube.
  4. Center the landscape object in the telescope.
  5. Align the finder scope so that it points exactly where the main telescope is.
  6. At night, leave the scope out to reach thermal equilibrium (about an hour for small reflectors and refractors)
  7. If the scope is on a EQ mount, polar align.
  8. Point the finder at the moon. The moon should be in the main scope also.
  9. Practice finding the moon before you start on the planets
  10. Once you are comfortable with the moon and planets, you can go for the deep sky objects

Sep 10, 2014 | Galileo FS-102MOH Telescope

2 Answers

I would like to be able to take a good picture of a full moon on a clear night.


You're going to face two separate problems here.

One, the moon occupies a rather small portion of the night sky. Even fully zoomed in, the moon is going to be not much more than a bright spot in the sky.

Two, the camera is designed to assume that almost every scene is an average brightness. Given how much of the scene is a black sky, the camera will attempt to render the sky as average (what photographers call a "medium gray"). This will result in a picture with a gray sky and a featureless white blob for the moon.

If you think about it, the full moon is nothing more than a really big rock under a midday sun. Thus what you want is the same exposure as when taking a picture on a clear sunny day. Unfortunately the camera is going to be fooled by all that dark sky and try to compensate for it. What you really need is to be able to bypass the camera's light meter and set the proper exposure yourself. The C195, unlike more sophisticated cameras, doesn't allow you to do so. Sorry, but that's just the way it is.

Mar 24, 2013 | Kodak C195 Digital Camera

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Can I take clear good pictures of a full moon on a clear night?


You're going to face two separate problems here.

One, the moon occupies a rather small portion of the night sky. Even fully zoomed in, the moon is going to be not much more than a bright spot in the sky.

Two, the camera is designed to assume that almost every scene is an average brightness. Given how much of the scene is a black sky, the camera will attempt to render the sky as average (what photographers call a "medium gray"). This will result in a picture with a gray sky and a featureless white blob for the moon.

If you think about it, the full moon is nothing more than a really big rock under a midday sun. Thus what you want is the same exposure as when taking a picture on a clear sunny day. Unfortunately the camera is going to be fooled by all that dark sky and try to compensate for it. What you really need is to be able to bypass the camera's light meter and set the proper exposure yourself. The C195, unlike more sophisticated cameras, doesn't allow you to do so. Sorry, but that's just the way it is.

Mar 24, 2013 | Kodak Easyshare C195 14 Mega Pixels...

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How do I set the settings to take a night moon shot?


Assuming you mean pictures of the moon itself and not a night shot with the moon in it, set your camera to the manual exposure mode and ignore the light meter.

There's an old rule-of-thumb called the "Sunny Sixteen Rule." This states that the proper exposure under a midday sun is an aperture of f/16 and a shutter speed of 1 over the ISO. For example with an ISO 200 film or a digital sensor set at ISO 200 the proper exposure is f/16 and 1/200 second.

What does this have to do with night shots of the moon? Well, the moon is simply a large piece of rock under a cloudless midday sun. Thus the Sunny Sixteen Rule gives you a starting point for the exposure. You can then refine it by reviewing the picture on the LCD and looking at the histogram. The sky will go completely black and you won't see any stars, but you should be able to see at least some of the features of the lunar landscape.

Aug 31, 2012 | FujiFilm FinePix S2940 18X Ultra Zoom 14MP...

2 Answers

Do i need anything special at night table top telescope i can not see anything


All telescopes have very small fields of view-- it must be pointed directly at the object in the sky or you will not see anything. Simply put the eyepiece with the largest number written on it into the focuser-- then during the day time practice focusing on a distant object like a building or telephone pole.

The moon should be your first target at night.

Aug 14, 2011 | Bushnell Voyager 78-9470 (470 x 60mm)...

1 Answer

I have a meade 40AZ-P telescope How do you set it up to view objects. It shows nothing?


This is really not suitable for viewing objects in the night sky -- except for the moon possibly. It is only 40mm ---- a pair of 10x50mm binoculars has more like gathering power than this small refractor scope.

Just put the eyepiece with the largest number written on it into the diagonal at the rear of the scope (the focuser) take the scope outside during the day time and practice focusing on a distant object. The moon should be your first target at night. Again this scope is really not suitable for viewing the night sky.



www.telescopeman.org
www.telescopeman.us
www.telescopeman.info

Aug 13, 2011 | Meade EU-40 AZ-P Telescope

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Hi When I try to take pictures of the moon at night, the all I get is bright light without any detail. The sensor seems overloaded and the image seems smudged. I have tried with the intelligent...


All automatic-exposure cameras try to render the scene as a middle gray. The moon is a small portion of the total image, so the camera concentrates on the sky. In trying to get enough light to make the sky go from black to gray, the moon gets completely overexposed. What you want is the moon properly exposed, even if that means the sky goes completely black.

For a full moon, you want the same exposure you would use at noon on a bright day. If you think about it for a moment, it becomes obvious. The full moon is simply a landscape at high noon. Unfortunately, the camera can't know that.

Set the camera to manual. Start with the "Sunny-16 Rule", which tells you to set the aperture to f/16 and the shutter speed to 1/ISO. So for example, set the ISO to 200, the aperture to f/16, and the shutter speed to 1/200. Look at the result on the screen and adjust the exposure as needed.

That was for a full moon. For other phases you may need to add exposure, but the "Sunny-16 Rule" will still give you a starting point.

Jun 18, 2011 | Panasonic Lumix DMC-LX3 Digital Camera

1 Answer

I live in the Florida Keys and going to try and take some photos of the supper moon tonight. What settings do you suggest for a Sony SLT-A55V. I tried to use my longer lens last night without a tripod...


Take you camera off the automatic exposure setting. Left to itself, the camera will try to make the black sky a middle gray. You want to treat the moon as a landscape under noon sun. If you think about it, that's all it is. The moon is simply a large rock or mountain, lit by the same sun you get at noon. This is where the "Sunny-16" rule comes in. The proper exposure for a full moon is an aperture of f/16 and a shutter speed of 1/ISO. For example, if your ISO is set for 200, the shutter speed should be about 1/200 second. Any equivalent exposure will work as well, for example f/11 at 1/400. You can then review the picture on your display and adjust accordingly. The sky will go pure black, but that's okay. You're not taking a picture of the sky, but of the moon.

Mar 20, 2011 | Cameras

2 Answers

How to use telescope at night?


Many people have the same problem-- with these small telescopes you are stuck with seeing only the moon, and several other planets, and maybe a few bright star clusters.

These are all TINY objects (except for the moon).... when you look through the telescope you are looking at a section of sky about the size of your fingertip held at arms length-- the scope must be pointed DIRECTLY at the object. Practice on the moon first-- and then try to find Saturn which is up in the sky right now-- it looks like a dim (slightly yellow) star.

Download a free star chart at www.skymaps.com ---

Apr 01, 2009 | Edu-Science (10166) Telescope

1 Answer

Computer not accurate


Looking through the manual (link follows) please check that you set the time in 24 hour clock with timezone correctly. Also the date & of course location. I see no reset function in the manual but I guess leaving the batteries out for a while will reset it. Manual link: http://www.bushnell.com/customer_service/manuals/telescopes/78-8876_1LIM.pdf Also although it says you do not need to know where the stars are you're aligning to it's good to have some idea that you're actually aligning with "Mizar" or whatever. You can find maps of the night sky where you are on this link: http://www.wunderground.com/sky/index.asp Finally check if there is a local astronomy group that you can join, they are always ready to encourage & help people.

Jul 29, 2007 | Bushnell NorthStar Goto 100mm 788840...

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