... 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 . ...