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The Warthog

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Everything posted by The Warthog

  1. @ Kef9 - How do you like the Antares zoom? I've pretty well committed myself to Antares, and am very happy with them, but haven't tried the zoom eps. TIA
  2. Full Moon isn't the best time to study the Moon, as the shadow detail disappears and much of the features are washed out. The best strategy is to watch the Moon on successive nights, and go along the terminator (The line between light and dark) and pick out the very visible features within 10º or so of the terminator. You will always find something worth seeing, and things you either haven't seen before, or have seen and forgotten. There are over 2,000 craters, as well as seas, lakes, bays, rays, valleys, mountains, rilles, the list goes on and on. Within a few days of the Full Moon you can se
  3. It is identical to the Celestron Omni 6" reflector, but if you zoom the photo enough, the plate under the focuser appears to be two words, a short one and a long one, which would make it the Skywatcher. The two scopes are indistiguishable.
  4. Confusion, conflict, misunderstanding - my work here is done.
  5. Except that shows you the Earth as seen from the Moon. But if you hold the football at arm's length, with your hands top and bottom, and rotate, keeping the "Wilson" stamp towards you, you will see the phases of the Moon, while anyone outside your arms will see all sides of the football as it rotates. Of course, you will produce a football eclipse at full football. Or, walk around somebody keeping your face towards him. He will see only your face, but people outside your circle will see all sides of your head. To do this entirely correctly, he would have to rotate 30 times while you were going
  6. Only if you feel you are missing something. Are there times when 93x isn't quite enough, but 200x is too much? If there are, then you might want to stick something in the 12mm range in there. I have a gap in my kit at 16mm, but I don't want it, and I get 12mm very occasionally by Barlowing my 24mm, but this is on very rare occasions. I sometimes use my Barlow with the 7.5mm to get 200x on the Moon, but usually I go straight from my 24mm at 31x to the 7.5mm (100x) or the 4.8 (156x). I do mostly Lunar observing. If my skies were better, I might be interested in filling that 16mm gap.
  7. There's an annoying glitch at present in the presentation of local time on the S&T GRS chart. The times after 1200 hr are given in 12 hour clock, but without a corresponding PM or AM. You have to interpolate this frm the UT time given in the left panel.
  8. If the Moon is a little further away during an eclipse, such as the eclipse I watched 30 miles away from my home in '94 or thereabouts, we get an annular eclipse because the moon appears smaller than the sun, and leaves a ring of light at totality. The Moon is indeed almost the same size as the sun, and its orbit is such that eclipses are a fairly frequent occurrence, and the full Moon lasts all night whether in winter or in summer. It is also large enough to create tides which aided in the transition from sea borne life to land borne life. Makes me think that God did a pretty spectacular job
  9. What a superb Idea! I think I'll share that one around. You could even paint over the lens.
  10. This is called 'libration', and is shown on the VMA Moon Atlas, among others.
  11. When you put a Barlow into the mix, you want to consider what focal lenghts it gives you. The 10 mm with your 3x Barlow will give you 3.3mm, which is close enough to the 3.75mm you get using my formula. Try it and see if it works; this article is meant to give you a starting point, not to be the final word. If the quality of the view suffers with the barlow, consider getting a 3 or 4mm ep.
  12. Here in Canada we have a thing called a milk crate which is a heavily constructed 12 x 12 x 12" plastic box, I have often seen them used under shorter dobs to increase the height. Something like that, or a homemade box of the appropriate height would do well, as well as being a place to put odds and ends that you have to carry over to your site.
  13. This is where I put mine. As for the holes that are left by moving things about on your OTA, you can leave them alone as they do no harm, cover them up with sticky aluminium from the auto body section of the DIY, or occasionally blow gently across them to produce a deep, sonorous and aethereal sound that will unite you with the cosmos.
  14. Try moving it around with double-sided tape until you get a location that doesn't interfere with your movement of the focuser or finder. I put my RDF betweem the finder and the focuser. I have a 7x50 RA finder on my Newt, and you really need the RDF to get yourself into the right area, as the RA finder doesn't point to the sky as intuitively as a straight through finder.
  15. I read during the 'what ia a planet?' debates that in a million or so years the barycentre of the Earth-Moon system will lie outside the surface of the Earth, thereby making the Moon a planet under the IAU definition. The rotational velocity of an object will make no difference to its gravity, as gravity is a function of mass.
  16. I suffer from diabetic retinopathy, and have had more than 16 laser sessions, as well as having both lenses replaced, and I suffer from Grave's disease which gives me vertical double vision and made the use of binoculars impossible until the doctors sorted out a pair of glasses for me. I'm about 1.5 mag behind everyone else in being able to see stars. On top of that I live in an area that is almost as light polluted as downtown Toronto, and I don't Know why I bother some nights. I have found that the brain does a pretty good job of covering those parts of the visual field that are missing.
  17. Consider getting a subscription to Sky at Night and perhaps Sky & Telescope as well. Both have good articles on current topics and current sky maps and info about what is happening month by month S@N also has a handy glossary.
  18. The shadow transit was over by the time I got there.
  19. I wanted to take in Uranus and Neptune as well as Jupiter and the Moon tonight, so before I went out I wrote down the RA and dec for each of the four targets. The Moon was hung up in the upper branches of my golden delicious apple tree, so I went to Jupiter first, centred it in the ep, then offset the mount by +2 degrees, and turned off the RA drive for seven minutes. I had to do this twice, but Uranus drifted into the FOV, and I was able to put a higher power on it and confirm a little bluish disk. I then put the scope on the Moon, which had drifted into clear sky, and offset the declination
  20. I would suggest you read the sticky on eyepieces to determine what ep you might want to supplement the two you already have. Beyond that, I would suggest you wait and read the posts here about what people are doing, and wait until a need presents itself, rather than end up spending money for things that you may not need all that badly. A UHC filter or LP filter isn't a bad idea, and if you have a Newtonian, a Cheshire collimator is a handy thing to have.
  21. The seeing is often good here, but the transparency can be a bitch.
  22. There is a lot of wonder to be had in viewing the sky visually, without encumbring yourself with thousands of pounds worth of equipment. If you want to look at photograps of things you can never see visually, you can Google them to your heart's content, buy a book or calendar of brilliant photographs, or come here and go through the excellent POWs. As a lifelong photographer, I believe that the camera gets between you and the thing itself, and you lose appreciation for the photographed object while you are fussing about exposure times and aperture. And now, S2N ratios as well! You can visuall
  23. I put my RDF between the existing finder and the focuser, which works well for me. A friend of mine has a Rigel that he mounted halfway up the tube of his Dob. That is an excellent position for this application, as it doesn't get in the way of anything.You can mount it anywhere you want as long as you're not going to bump it frequently, and the focuser and existing finder don't interfere. Some people with very large Dobs put the finder at the bottom. No reason not to do that on a smaller scope, either.
  24. You don't need a map and compass to walk about your own town. Take a decent star map, such as the one published in any current astronomy magazine, take it outside, hold it up, and learn the constellations. Set yourself little exams and check them against the map. ("OK, if that's Cassiopeia, that must be Perseus to the south" kind of thing.) Some of the constellations are fiddly to pick out, so for now just do the brighter ones. I can't see Cancer at all from my location because of the LP, so I just skip over it with my naked eye. Once you get the feel of the neighbourhood, you will be much mo
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