... Sighting the telescope, first at the tree and then at pole B, you measure the angle A of the triangle ABC, equal to the difference between the numbers you have read from the azimuth plate.. ... Why triangles? ... One large surveying project of the 1800s was the " Great Trigonometric Survey " of British India. ... Everest was the one who commisioned and first used those giant theodolites; they are now on display in the Museum of the Survey of India in Dehra Dum. ... Everest . ...

... The greater the distance, the smaller the parallax. ... That triangle has the same proportions as the much larger triangle ABC, and therefore, if the distance B'C to the thumb is 10 times the distance A'B' between the eyes, the distance AC to the far landmark is also 10 times the distance AB. ... The most distant objects our eyes can see are the stars, and they are very far indeed: light which moves at 300,000 kilometers (186,000 miles) per second, would take years, often many years, to reach them. ...

... Starcounts 101 Galactic halo ­ science issues Observational strategies Starcounts 101 · N(d) (d) . ... M/H], luminosity ) distance The disk is well-sampled at bright magnitude (V 19) The halo is well sampled at faint magnitudes (V 20) Stars outnumber galaxies V 20 Galaxies outnumber stars V 21 high spatial resolution is essential at faint magnitudes HST is favoured for studies of the Galactic Halo Stellar Number Densities Baseline ­ Keck LRIS observations of PSR1640 ...

... ATNF Home . About ATNF . ... About ATNF overview . ... Governance overview . Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Our people overview . ... Publications overview . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . ... Mopra radio telescope . ... Parkes | ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... We summarize recent attempts to detect warm ionized gas at large galactocentric distances. ...

... Posts tagged ?Mahalanobis distance? ... It bears the name of its inventor, Prasanta Chandra Mahalanobis. ... Therefore, under different names, I believe that the Mahalanobis distance is frequently applied in exploring and analyzing astronomical data. ... MADS] Mahalanobis distance? Tags: LDA , MADS , Mahalanobis , Mahalanobis distance , multivariate , outliers , PCA . ... 6 Comments . ... Entries RSS . ... vlk on [MADS] Parallel Coordinates . ... Entries (RSS) and Comments (RSS) . ...

... After all we cannot send a probe to the star Altair to confirm that it is 17 light years away. ... The "Bessel determined that the star 61 Cygni was about ten light years away" Earth goes around the Sun in one year, so in six month it is in the opposite position in its orbit. ... In 1838 Bessel determined that the star 61 Cygni had a parallax of 0.314 arcseconds and therefore the star was about ten light years away (today the distance is more