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  • How big is one arcsecond at various distances?
    An arcsecond is a small angle, 1 3600 of a degree or about 5 millionths of a radian ($4 85\times10^{-6}$) To estimate the size of something that appears 1 arcsecond across you can use the small angle approximation to trigonometry: Multiply the distance to the object by $4 85\times10^{-6}$ Examples: One arcsecond on the moon is 1 87km
  • Whats the difference between minutes and arcminutes?
    Here's the arcsecond Ngram The results for "arc minute", "arc-minute", etc, are similar However, the terms "minutes of arc" and "seconds of arc" were quite popular before that era, and it appears they have mostly been displaced by "arcminute" and "arcsecond" minutes of arc seconds of arc
  • What is notable about LOFARs sub-arcsecond radio resolution of distant . . .
    What is notable about LOFAR's sub-arcsecond radio resolution of distant galaxies? The notable aspect of this achievement is that we can now study radio-emitting sources at a similar resolution as optical telescopes and higher-frequency radio telescopes, which have had no trouble reaching these resolutions before
  • What is a parsec and how is it measured?
    the length of the long leg of a right triangle, whose short leg is one astronomical unit when the angle between the Sun and the Earth, as seen from an object in space (a star for example), is one arcsecond Illustrated (from the link above):
  • Measuring distance to stars - How to get parallax angle
    Your assertion that 1" = 0 000277778° is correct An arcsecond is 1 60th of an arcminute, and an
  • galaxy - How bright is Andromedas center, in magnitudes per square . . .
    Ideally a contour map or scan across the center might show brightness in magnitudes per square arcminute or square arcsecond Or a low power digital photo with some kind of brightness scale per pixel Older images such as the one below are from emulsion and so if they are just scanned and uploaded they will not be linear
  • Why do we use the value 206265 in the small angle formula?
    The number 206265 arcseconds radian is often used in astronomy for angular conversions It is simply derived from the product of 3600 arcseconds degree and 57 2958 degrees radian
  • What positional accuracy (ie, arc seconds) is necessary to view Saturn . . .
    Also, arcseconds (and arcminutes) are not seconds on a clock, instead an arcminute is 1 60th of a degree, and a arcsecond is 1 60 of an arcminute As opposed to a minute, which is 1 60 of an hour The Earth rotates at about 15deg hour, so the Earth rotates 1 arcminute in about 4 seconds
  • Do parsecs scale as an inverse proportion with parallax angle?
    For angles of magnitude 1 50 arcsecond (of the order $10^{-7}$, the difference between $\tan\alpha$ and $\alpha$ is truly negligible (if alpha is in radians) and only a matter of a choice of units if you don't It is quite correct to say: distance (in AU) = 1 angle (in radians) to get the distance from the angle in radians
  • observational astronomy - Does the . 43 arc-second per year deviation of . . .
    The perhelion distance of Mercury is 46 Mkm A 43 arcsecond shift is therefore approximately equivalent to a displacement of 9600 km, or 96 km per year (i e Construct an isoceles triangle with an opening angle of 43 arcseconds and equal sides of 46 Mkm The base will have a length of 9600 km )





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