I see!Wah!! 寫:I know he has sold the old setup already, then he get the current setup from me
有 1538 筆資料符合您搜尋的條件
- 週二 26 4月, 2011 11:56
- 版面: 太陽觀測和攝影 Solar Observation & Photography
- 主題: 20110425 Sun Spots
- 回覆: 6
- 觀看: 4037
- 週二 26 4月, 2011 10:53
- 版面: 太陽觀測和攝影 Solar Observation & Photography
- 主題: 20110425 Sun Spots
- 回覆: 6
- 觀看: 4037
I recall that you had a large aperture solar set up. I have always been looking forward to see its visual and imaging performance.
http://www.hkastroforum.net/viewtopic.p ... highlight=
http://www.hkastroforum.net/viewtopic.p ... highlight=
- 週二 26 4月, 2011 10:33
- 版面: 太陽觀測和攝影 Solar Observation & Photography
- 主題: 20110425 3D PST Sun!
- 回覆: 6
- 觀看: 3385
- 週二 26 4月, 2011 00:10
- 版面: 廠製儀器 Factory Equipment
- 主題: Reflectors vs Air-spaced vs Oil-spaced APOs
- 回覆: 38
- 觀看: 12500
if there are two apo scopes in these two different designs (with all same specs.) and both scopes are well made to their highest standard, can we truly or easily distinguish the better between them? I doubt that.... I would think exactly in the same way as you do before I saw the star test. In fact...
- 週一 25 4月, 2011 10:56
- 版面: 廠製儀器 Factory Equipment
- 主題: Reflectors vs Air-spaced vs Oil-spaced APOs
- 回覆: 38
- 觀看: 12500
- 週一 18 4月, 2011 13:41
- 版面: 天文話題 Everything about Astronomy
- 主題: 月面欣赏和觀察
- 回覆: 114
- 觀看: 69030
國外參考資料 http://www.imsc.edu.hk/pages/moon/rupesrecta.html This was a very poor pic taken a few years ago by me. The moon is a wonderful target. In the last week or so I took out my 18" for many times, not for saturn because it is almost the same everyday, but for the moon. Last thursday, just me and...
- 週一 18 4月, 2011 13:22
- 版面: 天文攝影 Astrophotography
- 主題: 20110413 月面 - 初試 2.5x Powermate
- 回覆: 14
- 觀看: 5752
- 週五 15 4月, 2011 10:49
- 版面: 自製天文望遠鏡 Amateur Telescope Making
- 主題: Nice moon poor mirror (20110414)
- 回覆: 1
- 觀看: 2912
Nice moon poor mirror (20110414)
Taken with a 6 inch mirror grinded by a student with a focal length of about 1000mm. The low contrast is because the student didn't bother to finish polishing it completely.
- 週四 14 4月, 2011 11:23
- 版面: 太陽觀測和攝影 Solar Observation & Photography
- 主題: 20110414 PST Sun 漂亮的日珥!
- 回覆: 16
- 觀看: 5770
Re: 20110414 PST Sun 漂亮的日珥!
I love proms!~Wah!! 寫:I love summer!~
- 週一 11 4月, 2011 01:06
- 版面: 談天說地 Chatting Square
- 主題: [另類言論]引力產生的原因終於被發現
- 回覆: 86
- 觀看: 25636
Well, the different definitions of weight is just a vey minor issue. The more important aspect is to distinguish the concepts of weight and mass. Most school textbooks should be clear enough about that. Apart from mass versus weight, all Hong Kong school textbooks are also clear about the differenc...
- 週日 10 4月, 2011 20:46
- 版面: 談天說地 Chatting Square
- 主題: [另類言論]引力產生的原因終於被發現
- 回覆: 86
- 觀看: 25636
Do physicists and engineers also disagree about the meaning of Newton's third law? Or may be I just misunderstand what you wrote earlier. The two camps do not disagree on the meaning of the Newton Laws, only on whether the force by gravitation on a body or the reaction force by a scale/floor/hangin...
- 週日 10 4月, 2011 20:14
- 版面: 談天說地 Chatting Square
- 主題: [另類言論]引力產生的原因終於被發現
- 回覆: 86
- 觀看: 25636
- 週日 10 4月, 2011 18:39
- 版面: 談天說地 Chatting Square
- 主題: [另類言論]引力產生的原因終於被發現
- 回覆: 86
- 觀看: 25636
Please explain the difference(s) between "apparent weight" and "weight"(beyond being apparent). As far as I know, weight is derived from the vertical force exerted by a person or an object on the floor or any device that prevent(or slow) the person/object from falling. The equal but opposite reacti...
- 週日 10 4月, 2011 16:22
- 版面: 談天說地 Chatting Square
- 主題: [另類言論]引力產生的原因終於被發現
- 回覆: 86
- 觀看: 25636
- 週五 08 4月, 2011 20:36
- 版面: 天文攝影 Astrophotography
- 主題: 奧米迦星團 @ 紅土地 (另一雜牌配答測試)
- 回覆: 13
- 觀看: 3973