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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. A

    Proper service???

    A friend of mine just had a service done on his combi and said the guy was only there 20 mins. From what he's said I think a visual inspection, gas rate, combustion analysis, clean out condensate trap and tightness test were done. That sounds fine to me but I only really do installs so wanted...
  2. J

    Water in new kitchen not "proper" cold

    I like drinking tap water and the water from our old kitchen (now utility) is always cold. I assume because it comes from the mains and is not sent about the house. Had a new kitchen fitted. The new sink's water comes from the pipes which serve the en suite upstairs, which is right next to the...
  3. P

    Proper man aftershave

    'Musk oil' sounds like it will drive the ladies wild :44:
  4. C

    proper rad / system balancing

    Can anybody point me to the right thread or tell me how to do this? been taught to close the lockshields down " a bit " on the rad closest to the boiler and carying on to close them off " a bit " but to close " a bit less " as im going along so that the furthest rad is fully open, but somebody...
  5. Keefy

    Am I responsible for adding isolation valves to old installs?

    If, for example I change a pair of taps (bath, basin whatever) for a customer is it my responsibility to also fit isolation valves if there were none there before to bring it up to current standards so-to-speak? If I were to have a customer refuse my advice on fitting some then I'd feel like I...
  6. C

    Hamworthy wessex 3x50 proper headache

    Hi guys, I'm after some help on a commercial site we look after for a housing association. Problem: All 3 modules locking out on main burner ignition segment of indicator dial intermittently but persistently ( almost all daily now but has been getting worse). Checked: everything :-) Replaced...
  7. S

    Question about proper use of drains

    Hi, My neighbor is on the brink of being evicted by the housing association that owns her house. The police have been to her house around 18 times since the beginning of last summer, her new alcoholic boyfriend is on a tag and awaiting a prison sentence and there is constant mayhem next door...
  8. S

    Question about proper use of drains as a tennant

    Hi, My neighbor is on the brink of being evicted by the housing association that owns her house. The police have been to her house around 18 times since the beginning of last summer, her new alcoholic boyfriend is on a tag and awaiting a prison sentence and there is constant mayhem next door...
  9. B

    Sludge flush failure DIY resolution (or how to do the proper & cheap job yourself).

    So you just bought or moved into the house, switched on the heating, and only some radiators are completely hot, while others are lukewarm with coldspots in the middle, and the gas/oil bill was massive while most rooms are struggling to reach even 18C and pose a heath risk? The previous...
  10. J

    jb

    Have problem with circulation on rads think to many added to original system, have 5-60 biggest Grumf pump but still wont push round to new added rad. Any one have an idea? jb
  11. L

    proper tv sports viewing

    At last, sport you can get into, 6 nations rugby on saturday no posing poofs on the sports field with rugby :29:when they get hurt, its proper hurt! :46:
  12. SimonG

    Bod Needs A Proper Job.

    Well done Lee, snook past 6k posts without a murmur. :) :)
  13. L

    Manual Radiator Valve

    Good Evening Can anyone help me with a place where i might be able to buy a manual radiator valve similar to the one in the picture. It is connected to a chrome finish towl rail. The tail coming up is 15mm going into a brass bush which connects to what i believe is a 1 inch valve. The pipe just...
  14. S

    Proper method for instaling push-fits

    Is their a magic technique for fitting push-fit bath tap tails to coper so that they don't come off 3 days later! They look like you just push them on, but other than ensuring the copper pipe is clean and unmarked, is there anything else I should do to make sure that they don't pop off after I...
  15. C

    Brown push fit bend in upstairs toilet

    I have just had my soil stack altered to accomodate a corner toilet without a flexi. I was very pleased with the finished result: the toilet flushes really well, no up hill pipe, and no worries about flexi in the wall falling to bits in 5 years time. However, 3 plumbers have been round to quote...
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    • Thread
    • attach bend brown center oil proper push fit toilet upstairs years
    • Replies: 4
    • Forum: Plumbing Jobs | The Job-board
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