... On the equator (point C) the sun would always rise until it was overhead, while at the poles (A and B) it would always be on the horizon, going around the horizon once a day. ... Because everything is symmetric with respect to the line AB, the dark and light portions are always equal, and so are day and night, anywhere on Earth. ... Twice a year, the angle is as big as it can get, at the summer and winter solstices , when it reaches 23.5 degrees. ... That part of Earth enjoys summer . ...

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• The Sky Above Us
• Principles of the Magnetic Trapping of Particles
• Lagrangian Points

... Like the night sky on the Earth, the martian sky hosts a plethora of astronomical phenomena occurring around the clock in a neverending space opera played out for the benefit of robotic and future human observers alike. ... Moons . Mars has two moons, Phobos and Deimos . ... Under the same conditions, Deimos would be as bright as -5, somewhat brighter than the planet Venus appears in Earth's sky. ... The moons are also eclipsed by Mars itself (a situation analogous to lunar eclipses at the Earth). ...

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• Armagh Observatory
• Planetary positions
• Mystery Flare | International Year of Astronomy in Ireland | Astronomy 2009

... Sphere . 1b. Pole Star . ... The Sun rules by daytime sky, but at night, especially if the Moon does not shine, the show belongs to the stars. ... To ancient observers it seemed as if Earth was at the center of a giant star-studded " celestial sphere ," which reinforced the belief, held for thousands of years, that we are at the center of the universe. ... Like the globe in the drawing, the sphere of the sky has two points around which it turns, points that mark its axis --the celestial poles . ...

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• Seasons of the Year
• The Celestial Sphere--lesson plan #1a
• The Moon: The Distant View

Heliocentric model of Aristarch Samossky (III c. B.C.). The Moon turns around the Earth. The Earth rotates around its axis, that is why the cauge of day and night can be seen. ... Aristarch model explained the modification of Venus and Mars glitter. In B1 position Venus is seen as a round dark spot on the Sun's disk; in B2 position it is seen as a bright spot of assimetric form. In M1 position Mars is nearer to the Earth and has more bright glitter than in M2 position. ...

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... Bad Astronomy . ... Bad Astronomy: The North Star, Polaris, is a very bright star. Good Astronomy: Polaris is a middling-bright star, easily missed. ... He said it was close to Polaris, the North Star, but he also said it was in the East. ... It's natural, I suppose, to think that such an important star should be bright, but really, that's a conceit, like thinking that the Earth is at the center of the Universe. If more people knew just why Polaris is the North Star, this Bad Idea would stop. ...

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... Venus Falls Out of the Evening Sky . ... In fact, after posing as the brilliant evening star for the first half of this year, Venus has now swung around its orbit and is emerging in the predawn twilight as the morning star . Taken during its stint as the evening star, this imaginative long-exposure photo, of Venus and a 2-day-old crescent Moon gives the illusion of the pair "falling out" of the western sky. ... Publications with keywords: Venus - evening star - morning star - sky . ...

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• Journal "Peremennye Zvezdy"
• Астронет > Venus Falls Out of the Evening Sky
• XWare > APOD

... In FOS polarimetry mode the incoming beam was split into orthogonal polarization components by a Wollaston prism behind the entrance aperture. ... As with non-polarimetric observations, no concurrent WAVECAL exposure was routinely taken with polarimetry data, so the limiting accuracies of the default pipeline polarimetry wavelength calibration are the same as for the non-polarimetry case described earlier ( See "Wavelength Calibration" on page 32-49. ...

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• Fixed Target Confirmation Chart FAQ
• Mode = ACQ/PEAKDConfig = COS/NUV
• Mode = ACQ/PEAKDConfig = COS/FUV

... Here are some tips on how to get the best guiding out of our current system. ... NA2 Guider Tips . ... Optical double stars, late-type galaxies, and bipolar PNs may pose a problem for guiding, as will objects where you desire to observe a position away from the bright center (e.g., SNs near bright galaxies). ... Field Star is good if your object is too faint or asymmetrical for Boresight guiding, or if you need the slit to be off-center. ... Use Field Star guiding almost always. ...

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• TUI:Scripts:Built In Scripts:Echelle:Trail
• TUI:Telescope:Slew Window:Options:Drift Scan
• sgs summary

... Activity 3: Measuring the Position of the Sun in the Sky . Purpose: To give students the opportunity to measure the position of the Sun in the sky using simple tools and methods. ... Alternatively, you may have students devise their own methods of relative measurement and apply them to measuring the position of the Sun in the sky. ... Rangi is the sky, and when the Sun is near Rangi's head it is summer in New Zealand. ... Read the Maori story to students. ... back to Teachers' Newsletter Main Page ...

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• ASP: To Every Season There is a Reason
• ASP: Indiana Jones and the Astronomers of Yore
• ASP: Up, Up, and Away

Next: A box, to include Up: To produce a region Previous: To produce a region . select cursor and circle . When in the image window, the mouse now has a box shape with an arrow at the upper left corner. The mouse buttons act as follows: . LEFT - to move the center of the circle at the position of the arrow point. ... RIGHT - idle. center the circle at the point source by positioning the arrow point and clicking on the LEFT mouse button. A circle will appear at the arrow position. ...

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• A box, to include extended emission
• Everyday Classroom Tools: Introduction to the Threads of Inquiry
• Spatial Region Coordinates

Left: An image in the near infrared (1.65 ЮМm) around RY Tauri, using a special mode of the Subaru HiCIAO coronagraph, the polarized intensity image. This type of observation is preferred for faint emissions associated with scattered light around planet-forming disks, as there is less light from the much brighter star. ... A white ellipse shows the position of the midplane of the disk, which is observed at millimeter wavelengths. ... Right: Schematic view of the observed infrared light. ...

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• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B63D833D8-103D-4FA8-87FF-FEFAD684280D%7D
• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B8A3C8865-5C69-4E65-9A69-DFEA0A4D24D8%7D

... An OBJECT column gives the name of the object observed (usually a star name). ... In critical cases, it is common practice to measure sky on two or more positions around a target object, and these positions must be identified. ... A general treatment of this problem requires a column called OBJECT, bearing the usual name of the object (as in the star tables); a column labelled STARSKY, to distinguish between star+sky, star alone, or sky alone; and additional columns to identify the sky position. ...

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• Source Positions
• Solar System Cosmology
• The FIRST Bright QSO Survey

... Miriad has a couple of tasks available for finding positions of sources (see also cgcurs in Chapter 17 ). ... It fits a 2-D parabola to the image intensities in a 3 by 3 pixel box centred on the brightest pixel in a specified region and reports the fitted location and intensity. ... Input image . ... The quality of your fit can improve significantly by selecting a snug region, and/or using the clip keyword to keep pixel values with little signal (e.g. sidelobes and noise) out of the fitting process....

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• kpvslice: interactive position-velocity slicing
• koords: interactive co-ordinate fitting
• The ``HIPASS Bright Galaxy Catalog'' (version-4)

... September 3, 1999 . Venus Falls Out of the Evening Sky . ... In fact, after posing as the brilliant evening star for the first half of this year, Venus has now swung around its orbit and is emerging in the predawn twilight as the morning star . Taken during its stint as the evening star, this imaginative long-exposure photo, of Venus and a 2-day-old crescent Moon gives the illusion of the pair "falling out" of the western sky. ... About APOD > . ...

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• Lighting plug-in
• APOD: 2005 July 1 - Ring Around Fomalhaut
• APOD: 2015 June 2 - Polaris and Comet Lovejoy

Lab . Main page News People . ASA . Master . Master net Homepage . ... Lomonosov Moscow State University Sternberg Astronomical Institute . ... MASTER . ... Lomonosov (ShOK) . ... About Space Monitoring Laboratory, scientific directions, instruments, contacts . People, who work in lab . Latest news and news archive . ... Bright MASTER OT105123.02+672528.3 discovery at Optical/X-ray/radio source position ATel3845, ATel3849 ATel3889 . ... All news ...

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ATMoB "Double Star Award " Guidelines Purpose: To promote observing among the membership of the Amateur Telescope Makers of Boston ­ in particular, double, triple, and multiple stars. Introduction: Double, triple, and multiple stars are the "Rodney Dangerfields" of the night sky. ... W hile they can be observed under a variety of sky conditions, double stars ­ especially close ones ­ are best viewed on nights when the seeing is steady. ... The direction from a star to Polaris is north. ...

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Tiedown 4 stated having problems on sat 02mar13. The encoder readout started jumping between the current value and 24 inches (first time around 11:00). ... The plots show the tiedown status for these two days: . ... There are large red jumps were td 4 encoder jumped. ... There are large jumps in td 4 torque (red) during the encoder jumps.l\ . ... I do wonder why the cpu was commanding the td if the drive status had been set to off? . ... During these jumps there were large torque in td4 . ...

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• optics
• on,off position switching offsets
• pulsedPwrIntoAlfa

... Press Release Images . Individual Images . ... The right-hand image shows Hubble's close-up view of the galaxy's core, taken in December 1995 by the Wide Field and Planetary Camera 2. The bluish-purple clumps that form the ring are the clusters of infant stars. Two dark, wispy lanes of dust and a pair of blue spiral arms are just outside the star-forming ring. ... The gas is trapped inside the ring through the stars' gravitational attraction. ... Amazing Space | ...

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• Procedures for Observations
• The Discovery of the Galilean Satellites
• A collection of images

Finding Himalia, The Fifth Brightest Moon Of Jupiter . Articles | ... Himalia is the only moon other than the Galilean moons of Jupiter that is visible in an amateur size telescope. ... I normally use “The Sky” from Software Bisque for planning my observing sessions and in helping me find objects, but it only has the Galilean moons for Jupiter so I used Red Shift (version 3 at the time) which I also had on my computer. ... www.astronomy.net . ... dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

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• Pluto Is Not A Planet, But A Moon Of Neptune. - an Astronomy Net God Science

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• ALMA observes a ring around the bright star Fomalhaut
• Wide-field view of the sky around the bright star cluster IC 4651
• Wide-field view of the sky around the bright star cluster NGC 3532