... The Figure shows the parallactic angle in relation to the source position at (RA,DEC), the zenith of the telescope at (LST,AoLatitude), the hour Angle HA, and the azimuth direction AZ (in the picture the source has already transitted). ... Now suppose that a second feed was placed 1 beam width away from the central horn parallel to the azimuth arm. ... Figure 1. shows the parallactic angle rate versus azimuth angle for declinations 8 through 28 (spaced 1 degree steps from Arecibo's latitude). ...

... This document and the attached postscript figure document an analysis that I did to determine the optimum midpoint and required ranges for both the rotator and azimuth for the 2.5 M telescope. ... I simulate a series of drift scans on the sky for tracks that cover the northern survey area. These tracks cover the range in survey latitude of -60 to +60 degrees, spaced by 10 degrees. ... Along each track the azimuth, elevation, and position angle of the CCD is computed at 1 minute intervals. ...

. Sitemap . Contact . Search . Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . Philosophical Transactions of the Royal Society, Vol. 61, p. 410, 1771. Observations made by appointment of the Royal Society at King George's Island in the South Sea by Mr. Charles Green, formerly assistant at the Royal Observatory at Greenwich, and Lieutenant James Cook of His Majesty's ship the Endeavour. See also: . Venus Transit Exhibition . Last Revised: 2009 November 23rd .

... A revised machine-readable source list for the Rees 38-MHz survey. ... 233R ============================================================================ We present a revised machine-readable source list for the Rees 38-MHz (or '8C') survey with improved positions and no redundancy. The Rees 38-MHz survey covers an area of about 1 sr north of declination +60 degrees. The angular resolution is 4.5 x 4.5cosec(dec) arcmin**2 and the limiting flux density over much of the survey area is about 1 Jy. ...

... 12c. Venus transit (1) . ... Predictions for the transit give four "contact" times, at which the dark Venus disk touches the edge of the Sun's disk (marked by numbers on Figure 3 )" . First contact - Venus disk touches the Sun from the outside , on entry . Second contact - Venus disk touches the Sun from the inside , on entry . Third contact - Venus disk touches the Sun from the inside , on exit . Fourth contact - Venus disk touches the Sun from the outside , on exit . ... sin? sin? ...

... Peter J.K. "Jeff" Wisoff (Ph.D) . NASA Astronaut (former) . ... A veteran of four space flights, STS-57 in 1993, STS-68 in 1994, STS-81 in 1997 and STS-92 in 2000, Dr. Wisoff has logged a total of 42 days, 56 hours, 1 minute and 48 seconds in space, including , 19 hours and 53 minutes of EVA time in three space walks. ... Following 183 orbits of the Earth in 269 hours and 46 minutes, the eleven-day mission ended with Space Shuttle Endeavour landing at Edwards Air Force Base, California. ...

... Meta Index / Home Page / Parameter types . Angle parameters are intended for right ascensions and declinations, where conversion from hours/minutes/seconds or degrees/minutes/seconds may be needed. ... Note that the maximum range of the angle type is [-360,360] degrees. ... xxdxxmxx[.xxx]s (degrees, minutes and seconds) xxhxxmxx[.xxx]s (hours, minutes and seconds) [(+|-)]xxx[.xxx] (decimal degrees) . ... Note: Angle parameters are accessed by the task as a real value, in degrees. ...

... This year's eclipse is unique in duration. ... Although, at the present time, there are 6 solar observatories belonging to leading space agencies in orbit around the Earth, the eclipse of 22 July, 2009, will only be seen by two of them: the Russian CORONAS-PHOTON satellite equipped with TESIS telescopes and Japan's HINODE satellite fitted with an XRT space telescope. ... TESIS will be the first of the two devices (and the very first on Earth) to witness the solar eclipse. ...

This form calculates which transits of the 1039 known transiting exoplanets are observable from a given location at a given time. Specify a time window, an observing location (either an observatory from the list or choose "Enter latitude/longitude" at the end of the list), and optionally any filters (e.g. minimum transit depth or elevation). The output includes transit time and elevation, and links to further information about each object, including finding charts and airmass plots. ...

... HST . ... News and . ... When constructing the visits of your Phase 2 program, please consider the guidelines and rules given in the HST Primer, Section 6.2., to determine when to create new visits. ... Because the SAA reduces the full orbital visibility period of many targets for over half of the HST orbits each day (see Section 2.2.2 of the HST Primer), visits that require more than 5 consecutive orbits are less likely to have scheduling opportunities on most days of the HST observing cycle. ...

... Exposure Time Calculator (ETC) . Survey processing . ... VISTA is a 4-m class wide field survey telescope for the southern hemisphere, equipped with a near infrared camera (1.65 degree diameter field of view at VISTA's nominal pixel size) containing 67 million pixels of mean size 0.34 arcsec and available broad band filters at Z,Y,J,H,K s and a narrow band filter at 1.18 micron. A wide field visible camera, if constructed, could also be used on VISTA. ... Tile . ... ESO VISTA Public Surveys . ...

... Apache HTTP Server Version 2.2 . Apache > HTTP Server > Documentation > Version 2.2 > Programs . ... rotatelogs is a simple program for use in conjunction with Apache's piped logfile feature. It supports rotation based on a time interval or maximum size of the log. ... For example, if the rotation time is 3600, the log file will be rotated at the beginning of every hour; if the rotation time is 86400, the log file will be rotated every night at midnight. ... date and time (localized) . ...

Computer Ephemeris. Ephemeris for physical observations of the planets. Explanations. Each row of the table contains for date specified at 0h of Time Terrestrial Dynamical: . ... position angle of axis of planetary rotation (degrees) - 'P', . ... illumanated part of the disk - k, . ... position angle of disk point with minimal illumination (degrees), . longitude of central meridian of the disk (degrees) - 'merid1' - system I and so... phase correction (degrees). ...

... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... ESO Acronyms . ... Survey Telescopes . ... Images . ... Star Clusters . ... Usage of ESO Images and Videos . ... Usage of ESO Videos and Images . ... Stars@ESO . ... ESO Science Newsletter . ... VST . ... The first released VST image shows the spectacular star-forming region Messier 17, also known as the Omega Nebula or the Swan Nebula, as it has never been seen before. ...

Next: ktrek Up: ksnow & ktrek: displaying Previous: ksnow & ktrek: displaying . Rotating the table . In ksnow there six buttons to rotate the table ( Rotate +X, Rotate -X etc.) Clicking on one of the buttons rotates the table over + or -10 degrees around the axis and the rotated table is displayed. ... Movie . To make a movie, click (left) on one of the Movie buttons. ... Next: ktrek Up: ksnow & ktrek: displaying Previous: ksnow & ktrek: displaying Richard Gooch . ...

... A sundial with a vertical pointer (" gnomon ") will indicate noon correctly when its shadow points north. ... Cut the paper along the marked line: one half will serve as base , the other will be used to construct the gnomon . In the gnomon part, cut away the two marked corners. ... With the page folded in its middle, cut out along the curved line , cutting a double thickness of paper in one cut. ... Score the other two secondary lines, then fold the gnomon sheet along them. ...

... A comparison of the computed and experimental relations F max ( H), as well as comparison of drift scans of point sources across different horizontal cross-sections of the BP with the corresponding computed cross-sections were made. ... The drift scans of the point source 3С84 (H=87 o ) at the wavelength 7.6 cm across the horizontal cross-sections of the BP (black lines) and the computed horizontal cross-sections of the BP corresponding to them (red lines). ...

What will happen when the fragments hit Jupiter? ... All the fragments will enter Jupiter's atmosphere at an angle of 42 degrees from the vertical and impact near a latitude of 44 degrees south, but on the back side of the planet as seen from Earth (about 10 degrees in longitude behind the edge of Jupiter, as seen from Earth). ... Any body moving through an atmosphere is slowed by atmospheric drag, by having to push the molecules of that atmosphere out of the way. ...

... 20.06.2012 . ... Credit Copyright: Babak Tafreshi ( TWAN Explanation: Today's solstice , the astronomical beginning of summer in the north, is at 23:09 UT when the Sun reaches the northernmost declination in its yearly trek through planet Earth's sky. ... Of course, as summer comes to the north the midnight Sun comes earlier to higher latitudes. Recorded near midnight, this time series from June 6 follows the Sun gliding above a mountainous horizon from a latitude of 69 degrees north. ... June . ...

... 2012 June 20 . Venus Transits the Midnight Sun . ... Explanation: Today's solstice , the astronomical beginning of summer in the north, is at 23:09 UT when the Sun reaches the northernmost declination in its yearly trek through planet Earth's sky. ... Of course, as summer comes to the north the midnight Sun comes earlier to higher latitudes. ... The 2012 transit of Venus is already in progress, with Earth's sister planet in silhouette at the upper left against the bright disk of the midnight Sun . ...