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adapted from Observe: Eclipses, published in 1979 by the Astronomical League and "Safe Solar Filters," by B. Ralph Chou, Sky and Telescope, August 1981) . ... Tape TWO pieces of film together into a sandwich, and tape this over the opening in the cardboard. ... The cardboard frame will act as a shade from the bright Sun, while you safely observe through the film sandwich. ... Undeveloped film is not safe. ... tape . ... At the end of one of the tubes, tape the aluminum foil, and make a tiny pinhole. ...

... Archives . ... Discontinuation of weekly [arXiv] series . ... For a discipline that relies so heavily on images, it is rather surprising how little use astronomy makes of the vast body of work on image analysis carried out by mathematicians and computer scientists. ... images. ... Images may be Opened and Closed with different structure elements. ... Tags: close , dilate , EotW , Equation , Equation of the Week , erode , Morphological operator , open , set theory . Category: Imaging , Jargon | ...

... HST . ... APT . ... HST Overview . Overview . ... Phase I Proposing . ... Cycle 24 Announcement . ... Phase II Cycle 23 . ... Documents . ... After you have brought up APT you will see a "Help" menu on the top menu bar. From here you can also bring up the documents that will help you to learn APT. Phase I: You can bring up Phase I Specific APT Training Materials to learn about using APT to submit your Phase I proposal. ... These are the same documents you will find on the HST Website. ...

Main Sections LabIR main page . ... Before mounting FIRPO it is necessary to check the chopper throw. ... It is possible to make these measurements using a diaphragm and a battery light. The diaphragm is one of the small barrels (choose the one with the smallest hole for this purpose), and must be inserted, with the wide opening on top, into a special place close to the telescope focus (push well). ... Check quickly that no ice is being formed through the neck (use a long thin stick). ... open . ...

ChangeLog for dsplot ==================== Open SPRs/SCRs: *none* Version 1.14.6 - 2002-03-13 (UL) -------------- + fixed couple of minor doc problems Version 1.14.5 - 2002-02-20 (UL) -------------- + small adjustmens to test harness to account for gracebat/grbatch differences Version 1.14.4 - 2002-03-15 (UL) -------------- + small fix to make optmized compilation succeed ... Version 0.4 (MB) ----------- - fixed problem in parameter files. ... Upgraded the parameter file. ...

Two weeks ago a small space rock called 2008 TC3 made astronomical history as the first asteroid that both impacted the Earth and was also observed telescopically while still out in space and on its collision path with our planet. Since then, three more small near-Earth objects making very close approaches have been picked up by the Mount Lemmon Survey in Arizona, the third just a day ago. ... See also: Objects currently known to be within 45 million kilometres of the Earth . ...

... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Mars . ... An artificial comet holds secrets to Earths life . ... Comet to make close flyby of Red Planet in October 2014 . ... COMETS | ... Comet C/2013 A1 (Siding Spring) will make a close approach to Mars in October 2014. ... During the close Mars approach, the comet likely will achieve a total visual magnitude of 0 or brighter, as seen from Mars-based assets. ... Only registered members of Astronomy.com are allowed to comment on this article. ...

You Can Make Stellar Images Brighter . Articles | ... A few months ago I wrote an article titled "You Can’t Make Them Brighter". So why am I now writing that you can make them brighter. ... The image of a focused star is actually a small disk called the Airy disk, named after the 19 th century scientist Sir George Airy. ... For a given aperture, a smaller Airy disk means that the light is focused to a smaller disk and is therefore brighter. ... www.astronomy.net . About Astronomy Net | ...