Forum Replies Created
-
Posts
-
In Cassiopeia! Would that it could have waited a year until the 450’s anniversary of Tyco’s Nova of 1572.
If you like costume drama historical documentaries, this one about Johannes Kepler, including his time with Tycho Brahe, is quite excellent:
https://curiositystream.com/video/4108
(in case it’s cloudy when you go outside to look for the new nova of 2021)
Interesting insights. I should install some temperature / CPU clock monitoring software. Do you know of any?
Mind you, I value this PC for its silence and lifetime cost-wise it made very little difference to take the highest spec i7, so I’m not going to be too disappointed if a little performance is missing. Would a comparison against the same CPU in a laptop configuration be fairer? I _hate_ the sound of those little laptop fans spinning at highest revs!
No throttling that I am aware of. I have been using mine in ambient temperatures of up to 28-29C without problems so far. There are a lot of reviews on Amazon.com
https://aeon.co/essays/what-can-we-learn-from-the-lunar-pandemic-that-never-was
A long read but (topical?) and interesting
Xilman shows me up in my ignorance. Seeing 9,000 and with two minutes of lunchtime remaining, I was curious if 9000 was a round number in – for example – base 60. Unable to do that in my head I lazily googled for a converter and found this one
https://www.dcode.fr/babylonian-numbers
Enter, 9000 in the middle box and hit ‘convirtir’
Had I my wits about me I would have gone straight to Wolfram Alpha
https://www.wolframalpha.com/input/?i=9000+to+base+60
Anyway you learn something new every day.
This is immensely exciting! Seems it was not front page news and I would not have seen it without your post, Daryl.
There is a lot more going on on the moon that people realize.
It’s not a bad idea Martin, but I’m dealing with the metal back distance here (focus is on the secondary mirror), so the only way to adjust it is with spacers or custom made adapters between the rear port of the scope and the camera. At each iteration I would have to refocus and measure the quality of the image (perhaps the FWHM of suitably bright stars).
Ray-trace spot diagrams would replicate these tests exactly, and presumably manufacturers must run them in order to specify the optimal metal back distance of the scope. What doesn’t seem to be specified is any kind of tolerance, or the response of the spot-diagrams to different metal back distances
Thank you Andrew – I’ve started to realize (I also posted on cloudy nights) that the metal back tolerance must depend on each scope’s optical design and that the only way to understand the effect of a sensor being +/- mm off the exact position is probably to look at the manufacturer’s spot diagrams for those positions. Not easy information to get hold of nor easy to develop a rule of thumb for.
Hi John, I have been thinking the same thing. If the permanent pier gets in the way it can always be removed later (mine would be bolted to the concrete like a lamppost). It’s also quite a lot cheaper that the TriPier as a local machine shop will make it for me including a custom top plate.
Thanks again Daryl. Probably best if I get the artificial grass laid first and then decide, perhaps after some experiments with a photographic tripod.
I’m not in the least surprised by the possibility of life in the upper atmosphere of Venus. The microbes were carried there on board the Verena probes, which would hardly have been sterile at launch.
Hi Bill, thank you very much indeed. I didn’t expect to meet you on the forum. Your book is thoroughly engaging, thank you for it. If I am observing with a refactor and star-diagonal (currently a Borg ED-76, which shows plenty on the moon with a very clear image), I assume that I need the SCT-with-diagonal version, specifically this one?
https://smile.amazon.co.uk/dp/1931559295/ref=cm_sw_em_r_mt_dp_U_ImlaDb6BM30W9
