Mutley

It's open to everyone, just follow the link for a free ticket

Thanks for the info .. think I'll wait and see if a copy pops up on World of Books

Is this book any good? I tried Birmingham library - they've got one copy but it's missing (nicked). Wondered what anyone's thoughts were before I commit £28 to Amazon for the paperback 🙄

Bit off topic but as you're here @Captain Scarlet, is that a Berlebach Planet? Does it have a removable azimuth pin - just wondering if I got a Planet with an EQ6 fitting, would it also do for an AZ-100,?

Fleeting, but definitely something. Great image btw!

I think I saw that a couple of nights ago, visually (200mm classical cassegrain). Mistook it for the GRS until I realised it was in the wrong equatorial band.

No, it won't fix the tracking. But it will tell you if it's just tracking in azimuth, like you suspect . Knowledge is power

With my EQ6 there is an option under the utility menu to display actual motor position rather than RA/Dec or alt/az. If you also have this option on the az-eq5, it should give you an idea of what the mount is doing. It's under Utility -> Show Position -> AX1/AX2 option (Assuming you're using a handset )

Interesting, thanks @Leo S. Does you're note imply that you only get circumzenithal arcs in equatorial zones, where the sun gets closer to the zenith (in the case of sun-generated zenithal arcs) ?

Well, it's a real thing - "Lunar circumzenithal arc" , half way down this Wikipedia page: https://en.m.wikipedia.org/wiki/Circumzenithal_arc

In addition to the moon halo, just saw another moon ring. This one was fainter than the moon halo, centered more or less on the zenith, with the moon lying on the circumference. I was able to trace almost a complete circle around the zenith, fading out as it got close to the moon. Picture below, which I've enhanced a bit. I've never seen anything like this before. Any ideas?

https://en.m.wikipedia.org/wiki/Lunar_standstill#:~:text=A major lunar standstill occurs,28.725° north or south. This is why the moon is rising waaay round to the north (for part of the lunation)

I'm always surprised by the amount of stuff that crosses the field of view when I'm moongazing - birds, planes, superman not so much. Usually high magnification too - so about 20' FOV or less. What are the chances? Seriously, who's good at maths?

Bit off topic but this needs amplifying. No one ever mentions centre spot placement, and it's so fundamental. @Captain Scarlet your post from last year -the 345 triangle method was a game changer for me. Works really well.

Do you mean when an object transits - crosses the meridian from east to west ? But it would be moving parallel to azimuth, and not changing altitude . Is your post the wrong way round or am I confused?