... We can help students grasp the significance of Hubble's extremely keen eye, and learn a bit about angles and math in the process, with the following in-class activity. ... Looking through binoculars or telescopes allows us to magnify a small section of the sky. To measure sizes or distances in that small section, astronomers divide a degree into 60 smaller pieces called arcminutes, and further subdivide minutes into 60 smaller sections called arcseconds. ... 30 feet = . ... 36 seconds . ...

... la fa?on dont le disque sombre de Venus tangente le bord du disque du soleil (marqu? par des chiffres sur la Figure 3 )" . Premier contact : le disque de Venus touche le soleil par l'ext?rieur , en y entrant . ... Fig. 3 les 4 contacts de Venus . ... h = (R?r) cos ? ... C'est ce dont nous avions besoin : Comme Halley l'avait indiqu?, la distance D entre le trac? des passages est maintenant exprim? en diff?rence du temps observ? entre les passages, aussi bien pour l'intervalle du temps observ? ...

... 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. ...

Operations in Point operations use the pointer to query sets about points, delete points in a set, and move points. In all cases where interaction is required, pressing the right mouse button with the pointer in the drawing area cancels the operation. ... Report on a point in a set . ... Press the left mouse button. ... Press Delete point with the left mouse button to activate. ... Move the pointer to the new location and press the left mouse button again to register the point's new location. ...

... Abstract Convert from spherical coordinates to latitudinal coordinates. ... Brief_I/O VARIABLE I/O DESCRIPTION -------- --- -------------------------------------------------- r I Distance of the point from the origin. colat I Angle of the point from positive z axis (radians). lons I Angle of the point from the XZ plane (radians). radius O Distance of a point from the origin lon O Angle of the point from the XZ plane in radians lat O Angle of the point from the XY plane in radians . ...

... This distance is equivalent to 3.26 light years. ... The Universe was now a large place and the intrinsic energy output of the stars had to be huge in order that their light could reach us. ... Newton implicitly assumes space is flat . ... An Orbit in Curved Space This is a prediction made by General Relativity and confirmed by direct observation of Mercury. The Ant Universe in Flat Space . ... Hubble noticed a correlation between recessional velocity and distance. ...

... connection points . ... The point P3 is the connection between the horizontal and vertical actuators and is the axis of rotation for the tail gunner motion. processing: survey/020204/reduc We can compute P3,P5 (the moveable points) in dome centerline coordinates if we have the actuator distances and we know the positions of the above connection points in dome centerline coordinates for a given position of the tertiary (say the nominal focus position).(see actuator distances to dome centerline ). ...

WCSLIB љ 5.15 . ... sph.h File Reference . Go to the source code of this file. intљ . sphx2s (const double eul[5], int nphi, int ntheta, int spt, int sxy, const double phi[], const double theta[], double lng[], double lat[]) . ... sphs2x (const double eul[5], int nlng, int nlat, int sll, int spt, const double lng[], const double lat[], double phi[], double theta[]) . ... sphdpa (int nfield, double lng0, double lat0, const double lng[], const double lat[], double dist[], double pa[]) . ...

... 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 precisely measured to be 11.4 light years). ...

... Bad Astronomy . ... Mad Science . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... How did early astronomers determine the distance form earth to the sun, and what method is used today to determine distances in space? ... Since Huygens knew the Sun-Venus-Earth angle (from the phases), and he could directly measure the Sun-Earth-Venus angle (simply by measuring Venus' apparent distance from the Sun on the sky) all he needed was to know the distance from Earth to Venus. ...

polimodel -- Produce model linear polarization and position angle images . ... Whether to apply random errors to output polarization and position angle values. seed = "" [integer] . ... This task produces a model linear polarization image and corresponding position angle image from an input image assumed to represent intensity (Stokes I parameter). ... A threshold for the input image can be defined such that polarization and position angle are not computed for input values less than this threshold. ...

polimodel -- Produce model linear polarization and position angle images . ... Whether to apply random errors to output polarization and position angle values. seed = "" [integer] . ... This task produces a model linear polarization image and corresponding position angle image from an input image assumed to represent intensity (Stokes I parameter). ... A threshold for the input image can be defined such that polarization and position angle are not computed for input values less than this threshold. ...

Voyager 2 raw image of Neptune's satellite Triton taken from roughly 500,000 km. ... The image was taken through the orange filter of the narrow angle camera. ... Central Latitude/Longitude (deg): N/A . ... Instrument: Narrow Angle Vidicon Camera . ... Instrument Field of View (deg): .424 x .424 . ... Phase Angle (deg): N/A . ... NASA Image ID number: FDS 11386.39 . ... Code 633, NASA Goddard Space Flight Center . Greenbelt, MD 20771, USA . ... Code 630, NASA Goddard Space Flight Center . ...

... But apparent angular size , or the angle covered by an object, can also be important to Moon enthusiasts . Angular size depends on distance, the farther away an object is, the smaller an angle it covers. ... Solar eclipses illustrate the happy coincidence that while the Sun is 400 times the diameter of the Moon, it is also 400 times farther away giving the Sun and Moon exactly the same angular size . ... NASA Web Site Statements, Warnings, and Disclaimers . ... Sun vs Super Moon . ...

... read input parameters find angles of the SIAM corresponding to current instrument STATT: calculate pointing of the star-tracker for ref attitude SRCinFOV: calculate FOV positions of 5 test sources intended FOV positions: add offsets (ry,rz) to FOV positions of 5 test sources minimize distance of "intended FOV positions" from SRCinFOV positions by of iteration SIAM angles and re-calculating STATT and SRCinFOV. print resulting angles . ...