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Proper motion is the astrometric measure of the observed changes in the apparent places of stars or other celestial objects in the sky, as seen from the center of mass of the Solar System, compared to the abstract background of the more distant stars.The components for proper motion in the equatorial coordinate system (of a given epoch, often J2000.0) are given in the direction of right ascension (μα) and of declination (μδ). Their combined value is computed as the total proper motion (μ). It has dimensions of angle per time, typically arcseconds per year or milliarcseconds per year.
Knowledge of the proper motion, distance, and radial velocity allows calculations of an object's motion from our star system's frame of reference and its motion from the galactic frame of reference – that is motion in respect to the Sun, and by coordinate transformation, that in respect to the Milky Way.

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  1. S

    Is this a proper drain line transition from 2 inch to 4 inch?

    Plumber replaced drain line under the bathroom. The drain line transitions from a 2 inch drain line to a 4 inch Y connector. Is this connection proper? I wonder if the Y connector should have a 2 inch opening to accept the 2 inch drain line to make this a proper transition.
  2. R

    Proper term for this tool?

    Hello! I'm Canadian so you may wonder what I'm doing on a UK plumbing forum. I'm basically just here to learn the British term for a tool that I've seen recommended in American plumbing videos. As you probably don't know, Canada has a curious mix of terminologies at times and sometimes we use...
  3. S

    New strainer needed. What is the proper name for this?

    Removed this from a valve in my heat pump it needs replacing as the top ring now loose. Does anyone know what its called and where to get one.
  4. R

    CH with Microbore bypass loops and proper bypass valve

    Hi - and thanks in advance for reading - just joined... I have been looking into why my heating takes ages to warm up - had the system power flushed and lots of things checked... Today, I found this: This is one of 4 manifold pairs - and it also feeds the worst of the radiators for not...
  5. V

    Grateful for some proper advice on our heating system please!

    Hoping you can help us with a heating system question that has caused a lot of anxiety for us as a family. Just grateful for some proper, practical advice. We have a 50-70 year old four bedroom family house that has a central heating system powered by a Worcester boiler downstairs (and a...
  6. J

    My kitchen sink plug whole stinks, is this a proper under sink setup?

    Evening. I’ll start by being honest, I’ve no idea with plumbing, I’ll understand basic concepts but... The house I’ve bought has a kitchen with the below photo of underside of the sink. In a morning or at occasions where it’s been left for a while when water (or whatever really) is drained off...
  7. J

    Proper functionality of a pressure relief valve

    Hi. Just wondering how a properly functioning pressure relief valve operates. Does it have it's its own mechanism that detects when the pressure is above 3bar? Or does in rely on the water pressure sensor? The two don't appear to be linked in any physical way. Also, when a correctly operating...
  8. leelister6

    UK Tiling Forum - they proper hate us don't they?

    Been looking at the tilers forum UK Tiling Forum as I've been getting quite a few refurbs and can't find a decent tiler so been doing it myself. Got some good gear and although I'm not particularly quick, I do a good job. Some of the blokes on there really have got a bee in the bonnet about...
  9. L

    Can anyone tell me the proper name for this?

    its all 22mm Thanks
  10. S

    Whats the proper name

    I'm getting calls to flats that have central boilers, (what we used to call district heating) and the distribution unit in the flat im thinking i need to train my self in fault finding but im not sure of the correct name for the unit ive heard them called hhu but googling that doesnt find...
  11. R

    Proper Plumbing

    Just got back from Petworth House. The big picture galleries and fine furniture were pleasant enough, but the real treasures are to be found in the old kitchens. The guide was telling me that the two taps are not hot and cold, but both cold - potable and non-potable. There was also an old...
  12. M

    Proper panic moment...

    Thought I'd lost nearly a grand cash today. Proper sick feeling in the pit of my stomach. Horrible, horrible feeling... But I've eaten now, and calmed down a bit...
  13. W

    Proper procedure for Working Pressure Test?

    Hi there, I'm doing my Gas Safe course at the moment and there seems to be some debate on the proper procedure fot working pressure tests. Some seem to think that you only have the appliance in question opporating, others think that all appliances need to be operating at the same time...
  14. B

    Neighbour's builder ruptured lead mains into flat, advice needed!

    Hi all, On Monday my neighbours builder, when putting a new fence in between our properties ruptured the lead pipe main inlet to our flat. I went outside and they told me they were going to fix it. Later I returned and saw the 'fix'. They had used some sort of plastic/rubber or similar wrapping...
  15. B

    Proper pint

    Anyone fancy a night out before Xmas , meet in huddersfield trains station pub then round town or jump on train locally ?
  16. T

    Proper ale bar!!

    Newly opened ale house in Wimbourne, 100 yds from the B&B......now thats just plain dangerous......Can you see that John Cropp...........no gassy lagers, well Perroni, but that is royalty among fizzy water.
  17. M

    Gas engineer required.

    Am looking for a gas engineer to come round and just turn off the gas supply to a tired old gas heater in the bathroom. This will be in Rushden, Northants.
  18. J

    Good day that ended proper sh@t

    First job, fit a rad in a conservatory. Got there later than expected thanks for ****ing plumb centre taking over half an hour to give me a length of capping !!! Made it up though by pulling me finger out an finished it an alright time. had to drive a bit then to do a breakdown, in an out job...
  19. S

    proper soil stack

    i took this picture on my travels last week to show the boys how a proper soil stack was fitted probably early sixties judging by the building style two pipe system and its just two floors when i got home and looked at the picture i hadnt even noticed the flue under the window
  20. S

    proper grub

    my tea
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