... 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? ...

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. ...

Program: TRACE Purpose: TRACE plots image values at user given positions as function of distance to a plot centre (in 2-d (sub)sets). Category: ANALYSIS, PLOTTING File: trace.c Author: M.G.R. Vogelaar Keywords: INSET= Give set (, subset): Only one subset is allowed. ... XYBOX= Give size of box around one pixel: [3,3] The resulting value at a selected position is an average of the pixels in the defined box around that position. ... POSITION= Give position x, y: Physical values are allowed. ...

... 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 . ...

... Any object with either a raw count-rate 70 or flagged as having a mod-8 pattern is checked to see if it might have diffraction spikes. ... Count the number of objects along position angles of 45 and 135 degrees from the centre of the star that lie within a radius of 10 and 120 pixels from the centre and a distance of no more than 5 pixels from the radius line. ... If the number of star along the spikes (n1) is > 3 * n2 then conclude that there are diffraction spikes and flag sources along the spikes...

. If an object is moving so fast that its kinetic energy exceeds this, it can escape out into space, never to return. Thus . Previous slide . Next slide . Back to first slide . View graphic version .

... Recherche dans le site : . Ciel Espace, le magazine qui vous guide toujours plus loin . ... des actualit†йs . ... des pages consacr†йes †а la publication de vos photos Mais c'est aussi une vraie communaut†й avec laquelle partager votre passion et nourrir votre curiosit†й. Accueil Plong†йe au centre de la Voie lact†йe . ... Ce n'est pas la premi†иre fois que le t†йlescope Hubble est point†й en direction du centre de la Voie lact†йe . ... 02/02/2016 - Panorama lunaire dans la mer des Pluies . ...

... Turn left on Calvert Street and proceed north approximately 3 1/2 miles to University Parkway. Turn left on University Parkway and proceed approximately 1/3 mile (past JHU stadium and down hill) to San Martin Drive. Turn left at the signal and proceed approximately 1/4 mile to STScI. ... Left onto Coldspring Lane and proceed approximately 1 mile to Roland Avenue (top of hill). ... Turn right at the signal and proceed approximately 1/4 mile to STScI. ...

Distance and scale Using the Orrery, look at one of the planet discs. Putting one end of a ruler or tape measure on the centre of the Sun disc and the other end in the centre of the planet disc, measure the distance between the centre of the Sun and the centre of the disc you have chosen. Planet |Distance from The Sun to the centre | of the discs (m) | ... Uranus is 19.6 times further from The Sun than Earth. Neptune is 30.7 times further from The Sun than Earth. ...

... Astrophysics Group . ... The Astrophysics Group is now based in the new Battcock Centre for Experimental Astrophysics, which is located close to the Institute of Astronomy off the Madingley Road to the west of Cambridge city centre. ... The Cavendish Laboratory itself is on J.J. Thomson Avenue on the University West Cambridge site across the Madingley Road. ... If eastbound towards the city, look for a long traffic island with a right-turn break through signposted J.J. Thomson Avenue . ...

... What is the distance D to the horizon? ... Your line of sight to the horizon is a tangent to the Earth--a line which touches the sphere of the Earth at just one point, marked B in the drawing here. ... D = SQRT(2Rh) . ... SQRT(2Rh) = (SQRT(2R))(SQRT(h)) . ... Using R = 6371 km, SQRT(2R) = 112.88, giving . ... From the top of Mauna Kea on Hawaii, an extinct volcano about 4 km high (also the site of important astronomical observatories), the horizon should be about twice as distant, 226 km. ...

... In short, ROMAFOT performs the best fit by comparing a given pixel to the value of the PSF at the centre of the pixel. This approximation is valid if the pixel size is small compared with the scale length of the point images. ... With the commands below the integral of the PSF over the pixel area is computed via the Gauss - Legendre integration formulae which are characterized by a high precision for a correspondingly small number of subpixels where the PSF must be calculated. ... MODEL/ROMAFOT . ...

Star formation is often best manifested by bright H II regions.These are regions of hydrogen which have been ionized by ultraviolet photons which are emitted from massive stars (typically stars more than 20 times the mass of the Sun). ... A narrowband filter image centered on this wavelength will then readily reveal these H II regions and hence the current sites of star formation in a galaxy, The luminous blobs that can be seen here are all H II regions . ... NGC 3558 Visual . NGC 3558 Infrared . ...

... Washington Reference. ... 1911PUSNO___6___A3U Informations. relative to: J1-Io: 427, J2-Europe: 228, J3-Ganymede: 153 reference frame: astrometric centre of frame: topocentre epoch of equinox: date time scale: UT1 reduction: no information coordinates: apparent distance, position angle diff. refraction: removed receptor: Clarc micrometer, Repsold micrometer. telescope: Equatorial, D = 26 inch observers: R., Br., ... Type of coordinate (1 - position angle, 2 - apparent distance) 2. ...

Image of Uranus taken by Voyager 2 about 21 minutes before closest approach. This image, centered at 4 S, 58 W, was taken with the wide angle camera. ... Central Latitude/Longitude (deg): -04.46, 057.63 . ... Instrument: Wide Angle Vidicon Camera . ... Instrument Field of View (deg): 3.169 x 3.169 . ... Phase Angle (deg): 107.17 . ... NASA Image ID number: FDS 26847.26 . ... Code 633, NASA Goddard Space Flight Center . Greenbelt, MD 20771, USA . ... Code 630, NASA Goddard Space Flight Center . ...

... June 4, 8 46.4 8.80 Moon enters umbra . ... eclipse|eclipseя– | eclipse | eclipse -----+-----+------+------+------+------++-----+-----+------+------+------+------ h mя– я– я– я€ я– я– я–я– h mя– я– я– я€ я– я– 8 40я – 5900я– 2.120я– 113.7я– - я– - я–я–11 10я – 3030я– 1.090я– 177.5я– 0.374я– 1.341 50я – 5599я– 2.012я– 115.6я– - я– 0.055я–я– 20я – 3078я– 1.108я– 184.0я– 0.350я– 1.317 я– я– я– я– я– я–я– 30я – 3166я– 1.139я– 190.3я– 0.306я– 1.273 9 00я – 5304я– 1.907я– 117.6я– - я– 0.203я–я– ...

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. ...

pro loadfits common ws_comm,namobj,solar_r,bunit,angle,xscale,centr_x, $ nfield,dtype,tdim, xmas , ddata ,status, wscan , base ,draw, $ list, fl_load ,fl_iv,nfile, twoscn ,exbeg,exend,wlsfrq ;pro loadfits wscan =-1 fl_load =0 nfile=pickfile(TITLE='Select Binary FITS file',filter='*.fit') if nfile eq '' then goto,x_ end fxbopen, fid, nfile,1 fhdr =fxbheader(fid) ndate=fxpar( fhdr ,'DATE_OBS') nobj=fxpar( fhdr ,'OBJECT') solar_r=fxpar( ...