| View single post by Robert | ||||||||||
| Posted: Tue Apr 9th, 2019 22:48 |
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Robert
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Well, I'm home and cold. Had to wait for the moon to set, I exposed a batch with the fisheye 16mm. I failed to lock onto Polaris properly but I now have a clear understanding of the issue. It's known that the earth's axis is wavering slightly which effectively means my scope from about 1986 is incorrectly calibrated. I have asked on several forums by what degree the relative location of Polaris has changed but nobody has given me a clear or definitive answer. However tonight I think I have cracked that one. While the camera was clicking away making exposures with the fisheye lens, I was thinking about the problem, it occurred to me that to swivel the Right Ascension movement around the Polaris axis 360º should reveal where it describes an imaginary circle with the hairline cross sight which denotes the celestial North pole. It *seems* that the little aiming circle which Polaris should be central in is about twice as far from the Celestial North as a it should be, however I gave up due to the cold wind. Pleased because I feel I am a step nearer. I will resume again tomorrow night if conditions allow, with additional clothing. The right angle finder makes it much easier to see what's going on. Pity the Go-Pro didn't work. I can see why people like these 'Go To' mounts but I ain't for spending a grand, or ten of them... Just to save a bit of head scratching. What's the fun in that?
____________________ Robert. |
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