According to relativistic mechanics, two events occur simultaneously if the light from each of these two spatially separated events meet at the midpoint of the line adjoining them, at the same time. Additionally if this simultaneity occurs in a reference frame that is considered to be stationary, then the events will not be generally regarded as simultaneous in a reference frame that is moving with a linear constant velocity v relative to the stationary frame. This may be true for light waves,
Toot and I had a wonderful week with Olly and Monique in the Haute Alpes. We enjoyed the magnificent dark skies, the stunning Milky Way, looking through Olly's big Dob and drawing and painting with Monique. We saw for the first time: The Crab Nebula, The Swan Nebula, The Eagle Nebula and all of the Veil Nebula. The Witches Broom was fantastic and through a wideangle eyepiece and Olly's monster of a Dob it appeared almost 3D. We also looked at the Lagoon and Triffid Nebulae before they droppe
24/10/15 Well today I removed the engine to strip and find the cause of the misfire and excess backpressure. Once the cylinder head was removed the cause was obvious, a holed and cracked piston on cylinder 4 and luckily no other damage to the cylinder, This should be a straight forward repair for me to do. As a precautionary measure I will have the diesel injectors checked and also check so se if there is a cooling oil jet when I remove the sump and piston.
Day 1 12/10/2015 Well Ive decided to build a mobile Observatory to allow easy movement and hopefully set up on sites quicker.This Blog will record the process in the various stages of the build conversion project. Donor vehicle is A 2004 Mercedes Benz frontline Ambulance with 200k on the clock. The engine is misfiring and preliminary checks would indicate piston trouble, as the engine is misfiring / lumpy and has excess back pressure at the oil filler cap. First job is to remove the engine f
According to the relativistic definition of simultaneity, if two spatially separated events occur such that the light waves generated by these two events arrive at the midpoint of the line adjoining them, at the same time, then these two events are considered simultaneous. However, if these two events occur in still air, then any sound waves that might also be generated may not arrive at this midpoint, at the same time. The events occur at the endpoints of their adjoining line and form a tandem,
Before I carry on with my 6 SE experiences I just want to thank all of you for reading my ramblings and for your comments and PMs. It is very much appreciated. I finally have some "me" time to continue the story.
The first thing I did when I got my box of goodies home was to unpack everything. A cup of tea came next.
My initial impressions were of a solidly built bit of kit. Without going industrial strength the tripod is sturdy. It is light(ish), but setting it up with l
Hello All Been a while since I last went out, due to cloud and timing of the clear nights, all ways when im on morning shift. During this time I’ve done a system swap from my Olympus E-510 to a Canon EOS1100D. got same kit off the bay, 2 zooms and a flash gun. Now have to get the old stuff sold. Saturday 12 September Got a few hours in last night, Visual only with the 150p on the EQ 3-2, with new motor upgrade. M39 open cluster
The perseus double cluster
M103 open cluster All were s
I decided to try the month's free access to the Bradford Robotic Telescope on Mount Teide, Teneriffe. So thanks 'Sky at Night' Magazine! The free trial is limited to a number of given objects and the exposures and filters are all preset, so you cannot go wrong, but all in all I was quite pleased. I am considering investing the less than prohibitive £3 a month inorder to try out the real thing. Seems to me a very inexpensive way of accessing objects near or below my southern horizon with bette
I've mentioned a few times that I've recently bought a road bike and have started riding a lot more and I though since I've not got anything astronomical to discuss I would do this instead :) I bought a nice giant defy 0 bike on the cycle to work scheme and spent an extra £200 swapping the brakes, chainset and front mech so it now has a full ultegra groupset.it's perfectly geared for an unfit ex smoker like me with a 50/34 chainset and 11-32 casette and I can get up most hills despite my heart
Well, you already know what I bought but it was a bit of a trek getting to the point where I made my final decision. All you have to do is have a quick read around SGL and you'll understand any telescope is a compromise. I'd not had much (if any) exposure to 'scopes other than my TAL-1 Newtonian. That is equatorially mounted with manual slow-mo controls. While it has 1.25" eyepieces, mainstream eyepeices tend not to focus with it - something to do with the small secondary so I think the primary
I've had a great time so far with my new Nexstar 6 SE. It hasn't been an entirely smooth journey and I see lots of posts in SGL about these and similar goto 'scopes and problems operating them. I'm no expert but I hope sharing my experiences here will encourage others to persist to the point where using their goto 'scope is a pleasure. I bought the 6 SE about a month / 5 weeks ago so have a bit of catching up to do blog-wise and I must do so before my memory fades!
As background, I u
The question I want to ask is: can the following thought experiment detect absolute motion, or will it detect a sort of intermediary motion; which is neither absolute motion, nor absolute rest? This intermediary motion is like Einstein relative motion, but without using a Galilean or Lorentz transformation between reference frames. It comes about when sound waves are used to investigate the motion of material objects through a stationary or moving medium. This air/medium is in and amongst two r
Well after what seems like 6 Months, about 30 hours polishing and 3 regrinding back to 400 grit I still can't seem to get rid of the astigmatism I have in the centre of my mirror.it was time to face facts that due to my lack of experience I could spend another 100 hours and end up with a too thin blank so I've left my mirror with John for him to machine it back to 400 and then polish it and make sure the astigmatism has gone before I finish the polishing and start to figure it.really dissapointe
Hello All Saturday 8 August Got the new ZWO120mm-s on the st80 as a guider atop the astromaster 130eq Went after M52 All went well apart from the backlash in Dec causing a drop off the chart. Had to up the correction time to 999ms (max) had a massive saw tooth pattern but it was bringing it back. So ive proven that the mount is guidable. Got a good image with round stars in the middle so I just need to fix the coma. Got the baader MPCC to try out once ive moded the astromaster to a 2inch focu
It turns out ImPPG's image alignment (via phase correlation) function comes in handy when trying to capture a video of passenger aircraft at cruising altitudes. My rig for the experiment was a SW Newtonian 114/500 (hence the coma visible in asymmetric highlights) on AZ4 + PGR Chameleon 3 mono (ICX445) camera:
Raw video looked e.g. like this (scaled down):
I cut out fragments with the plane constantly visible, converted to image sequences and run them through ImPPG.
Airbus A
The question I want to ask is: can the following thought experiment detect absolute motion, or does a sort of intermediary motion emerge which is neither absolute motion, nor absolute rest? It is like Einstein relative motion, but without using a Galilean or Lorentz transformation between reference frames. It comes about when sound waves are used to investigate the motion of material objects through a stationary or moving medium. According to Galileo, Newton, and Einstein, the principle of re
It's a very miserable afternoon in Lowestoft. It is raining and the sky is an unrelieved expanse of grey stretching from horizon to horizon. Early this morning the sky was clearer but not sufficiently devoid of cloud to permit the useful deployment of my 'scope. Due mainly to my overwhelming cheerfulness, I spent a happy pre-dawn hour with my 11x80mm binoculars looking at all the usual summer astro-culprits . This afternoon I have been removing malware with mixed success from two laptops. Why
Hello All Friday 17 July Big set up. 150pl on the exos 2 GOTO First target was Saturn to see what the longer FL made. I wasn’t disappointed, more magnification on the same EP. Used the 9mm x-cell (133x) the view was superb even though it was behind trees for a while and very low in the sky. Next outing I will capture some webcam video and see how it goes. 150p on the EQ 3-2 manual Found M57 ring nebula. This was more an experiment in seeing how my manual finding skills were. I must s
Hi all, So a quick blog today, just to keep things ticking over, and to keep track of my ideas etc – more for me to look back on more than anything else! Foot is a lot better now – I am getting around ok, and have even started a new fitness ‘regime’!! I have lost 6lbs in one week, by cutting out crisps and flapjacks, and doing 20 minutes of high interval training each morning! Go me!! I’m still scopeless, and will be until at least Autumn I think. Had my hours knocked down at work from 5 d
“the Story So Far” This is my first ever blog It started Christmas 2014 when I had a Celestron astro master 130 EQ with motor drive. I soon discovered that although the OTS part was great the mount and motor drive were severely lacking in quality and function. First I stripped and re-greased the mount and modified the motor drive to use 8 rechargeable AA batteries to provide more amps as the pp3 was poor in the cold. This made a massive improvement to the mount and made viewing a little mor
Hi all Been a while since my last blog entry. Following a meeting between my left foot and a rusty nail in the garden a few weeks ago, I contracted a very nasty infection that knocked me out of commission for nearly three weeks!! I am well on the mend now though, and finished my last course of antibiotics yesterday!! Still walking with a limp like some sort of peg-legged pirate!! It does mean on Tuesday I can finally open the bottle of Single Malt I got for Father’s Day!! Three different antib
Hi all relatively new to Astronomy I have a StarBlast 80mm from Orion without the Syn scan hand controller!! Has anyone had any luck using Stellarium to drive the scope without the $420 hand controller??? :laugh:
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