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Topic: Selenographic colongitude

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	Selenographic colongitude
		The selenographic co-longitude is the longitude of the morning terminator on the Moon, as measured in degreess westwards from the central meridian.
		The value of the selenographic co-longitude increases from 0° to 360° in the direction of the advancing terminator.
		Thus by full Moon the co-longitude increases to 90°; at last quarter it is 180°, and at new Moon the coordinate reaches 270°.
	www.xasa.com /wiki/en/wikipedia/s/se/selenographic_colongitude.html (230 words)

	Selenographic colongitude - Definition, explanation
		Any position on the lunar surface is completely determined by two numerical values, which are comparable to the latitude and longitude on the Earth.
		Sunrise occurs at the prime meridian when the Moon reaches First Quarter, after one fourth of a lunar day.
		Thus by the time of the Full Moon the co-longitude increases to 90°; at Last Quarter it is 180°, and at New Moon the coordinate reaches 270°.
	www.calsky.com /lexikon/en/txt/s/se/selenographic_colongitude.php (333 words)

	Selenographic coordinates (Site not responding. Last check: 2007-10-26)
		Selenographic coordinates are used to refer to locations on the surface of Earth's moon.
		The selenographic colongitude is the longitude of the morning terminator on the Moon, as measured in degrees westward from the prime meridian.
		Thus, by the time of the Full Moon the colongitude increases to 90°; at Last Quarter it is 180°, and at the New Moon the colongitude reaches 270°.
	www.worlditems.info /en/Selenographic_coordinates.htm (408 words)

	Selenographic colongitude (Site not responding. Last check: 2007-10-26)
		Selenographic coordinates are coordinates that refer to the surface of the Moon.
		The selenographic co-longitude is the longitude of the morning terminator on the Moon, as measured in degrees westwards from the central meridian.
		The selenographic co-longitude at sunrise is used for this purpose.
	www.infobadger.com /articles/Selenographic_colongitude (246 words)

	Selenographic coordinates . Enpsychlopedia
		Selenographic coordinates are used to refer to locations on the surface of Earth's moon.
		The selenographic colongitude is the longitude of the morning terminator on the Moon, as measured in degrees westward from the prime meridian.
		The selenographic colongitude is useful for this purpose.
	www.enpsychlopedia.org /psypsych/Selenographic_coordinates (432 words)

	Alcyone Ephemeris Documentation
		Selenographic longitude is measured from the meridian passing through the mean center of the lunar disc, the center seen from the earth when the moon is at the mean ascending node and the node at mean apogee or perigee, and is positive to the west (toward Mare Crisium)..
		Selenographic latitude is measured from the moon's equator and is positive to the north.
		The selenographic longitude and latitude of the sun, l (sun) and b (sun), are the selenographic longitude and latitude of the subsolar point, the center of the lunar disc seen from the sun, which is the center of the illuminated hemisphere of the moon.
	www.alcyone-ephemeris.info /documentation/aedoc.html (6779 words)

	NationMaster - Encyclopedia: Clavius (crater)
		Look up depth in Wiktionary, the free dictionary In classical physics, depth is a distance measured vertically from top to bottom (height) or horizontally from outside to inside (thickness).
		Selenographic coordinates are coordinates that refer to locations on the surface of the Moon.
		An eponym is a person, whether real or fictitious, whose name has (or is thought to have) given rise to the name of a particular place, tribe, discovery, or other item.
	www.nationmaster.com /encyclopedia/Clavius-(crater) (1108 words)

	Handy Books
		"The sun's selenographic colongitude is 154.23 degrees and increases by 12.2 degrees each day thereafter." Let's go back to front on this one.
		"Selenographic colongitude" is longhand for 'location of the sunrise terminator.' To make matters worse, it's measured from the central meridian westward from 0 to 360 degrees, while map coordinates are typically given values east and west of the central meridian.
		So a colongitude of 60 degrees is at "60 degrees west" on the map but a colongitude of 300 degrees is at "60 degrees east" on the map.
	ephemeris.sjaa.net /0501/b.html (731 words)

	[No title]
		For each day in the month, the program calculates the time of Moon transit, and then calculates for that time the optical libration of the Moon in selenographical longitude and latitude, the position angle of the Moon's rotation axis, the selenographic colongitude and latitude of the sub-Solar point, i.e.
		A further character is printed after the colongitude, an 'r' shows that the Sun is rising on the Moon, and an 's' indicates a waning Moon.
		I chose only one month to check, and a graph of the colongitude errors looked as if there might be a periodic term of amplitude about 0.02 degrees or so.
	www2.arnes.si /~gljsentvid10/tmoon.c (1396 words)

	Sirsalis crater and Albedo changes
		In the Sorrentino's Session the colongitude was 65anddeg; and the inner of Sirsalis was in shadow.
		In the Sorrentino's Session the colongitude was 65anddeg; and the floor in shadow (the value of altitude of sun was only 4.7).
		Albedo change was recorded only for colongitude about 75anddeg; and the solar altitude during the Sorrentino's session cannot give this variation.
	www.glrgroup.org /tlp/3.htm (877 words)

	Observing Tools
		The evening terminator is the colongitude plus or minus 180 degrees.
		Download a neat little lunar ephemeris program in a few minutes that you can use on your own computer.
		All figures here are based on geocentric coordinates, and position angles relate to the North Celestial Pole.
	www.new-star.org /clear_sky_clock.htm (481 words)

	Krishna (crater) (Site not responding. Last check: 2007-10-26)
		The selenographic colongitude of this grouping at dawn is 349°
		The rift near the mid-point is at selenographic coordinates 24.5° N, 11.2° E, and occupies a diameter of about 9 km.
		See the reference table for the general listing of literature and web sites that were used in the compilation of this page.
	vb.game-host.org /en/Krishna_crater.htm (241 words)

	Your First Session
		Colongitude: when the pointer is not on the moon, the colongitude is displayed.
		This is the lunar (selenographic) longitude where sunrise is occurring.
		This is one of the most important numbers for the lunar observer, because it pins down the sunrise longitude quite accurately, unlike the age of the moon.
	www3.telus.net /public/aling/lunarcal/Help/163.htm (2185 words)

	Lunar Domes - Article
		It is obvious that the identification of fine details such as depressions or craters on the summit, cover more of a basic importance for a deeper study, constituting an object for the more experienced astronomer.
		LONG: Selenographic Longitude (IAU) with which negative values indicate to the west (to right in telescopic view) and positive values are to the east (on the left in telescopic view).
		LAT: Selenographic latitude with which negative values indicate south (up in the telescopic view for the northern hemisphere) and positive values to the north (down in telescopic view).
	www.cloudynights.com /item.php?item_id=1399 (1476 words)

	OASI - TLP 1975
		If the object were merely a formation on the lunar surface, it should be visible again under similar conditions of illumination.
		Patrick replied to the effect that the feature was a depression which was not obvious in the usual way and which Roy and his colleagues had observed at the time when conditions were favourable.
		The break in the cloud permitted only a few minutes viewing but the feature appeared to still be present.
	www.ast.cam.ac.uk /~ipswich/Observations/TLP.htm (802 words)

	Lake County Astronomical Society NightTimes
		This will enable ALPO to calculate things like colongitude and solar altitude in order to determine when the rays are visible.
		And if you observed the craters when their rays could not be seen, that is also of great importance since it'll help determine when the rays are not visible.
		The selenographic observations can be compared with similar geological phenomena, if possible.
	www.bpccs.com /lcas/Articles/moonrays.htm (1069 words)

	Lunar libration and co-longitude
		The 'sub-solar point' is a point on the Moon where the Sun is overhead, ie the 'pole' of the illuminated hemisphere.
		By working out the selenographic coordinates of this point, we can calculate the appearance of the bright limb of the moon for any given time.
		The Moon 'turns the same face to the Earth', so that its rotation about its axis is equal in period to the time for one orbit around the Earth.
	bodmas.org /kepler/mooneph.html (848 words)

	sirsalis
		Only in Fig 6 (colongitude 87.3) was recorded a short shadow (extension about 1/4 of Sirsalis).
		Furthermore the shadow is visible for colongitude of 74.8 (altitude of sun 14.1anddeg;) as shown in Fig 4-5.The central peak of Sirsalis seems to be visible near colongitude of 74°.
		At this time the colongitude was 68.1 and altitude of the sun was 7.42anddeg;.
	digilander.libero.it /gibbidomine/fotometriasirsalis.htm (859 words)

	Indices to the the LPODs - project homepage
		The intended use for these lists is an observing aid to astronomy clubs and individual amateur lunar observers who want to improve their public educational star parties or their general enjoyment of the Moon.
		Observing plans and presentations can then be enchanced with Dr. Wood's insights and the numerous photographic contributions of many expert-level amateur astrophotographers including (to name just a few LPOD photo contributors) Paolo Lazzarotti, K.C. Pau, Mike Wirths, Wes Higgins, and Anthony Ayiomamitis.
		That feature was paired with the selenographic coordinates and feature name from the USGS Gazetteer.
	members.csolutions.net /fisherka/astronote/plan/LPODIdx/LPODIdxProject.html (1495 words)

	selenographic - OneLook Dictionary Search
		Tip: Click on the first link on a line below to go directly to a page where "selenographic" is defined.
		Selenographic : Online Plain Text English Dictionary [home, info]
		Phrases that include selenographic: selenographic coordinates, selenographic colongitude
	www.onelook.com /?w=selenographic (97 words)

	Optical Experiments
		You would need to record the selenographic latitude and longitude of the sub-earth point, and then correctly calculate the correction factor.
		The sub-earth point latitude and longitude are the points in the centre of the projected lunar disk for observations from the Earth.
		Note that the Colongitude of the Sun on the Moon should be between 90 degrees West (+90) and 90 degrees East (-90 or 270) as seen from the vantage point of the Earth, so please convert the angle to be between 0 and +/- 90.
	www-users.york.ac.uk /~phys38/moonexp.htm (4342 words)

	[No title]
		The drawings and images are generally oriented as in the usual telescopic view: South is up and West (IAU) is to the right.
		Selenographic coordinates, diameter or lenght, rim-floor height or depth are given for each feature.
		For images of medium magnification refer to the "large field images" section of this archive.
	web.tiscali.it /sezioneluna/archive.htm (100 words)

	Weblinks : Selenografie www.askblitz.com
		Den Längengrad, an dem auf dem Mond die Sonne aufgeht, nennt man die Selenografische Colongitude.
		Die Colongituden Null und 360 Grad kennzeichnen den zunehmendem Halbmond.
		Bei Vollmond beträgt die Colongitude 90 Grad (westlicher Mondrand).
	www.askblitz.com /title/selenografie/weblinks (294 words)

	Krishna (crater) Information
		The selenographic colongitude of this grouping at dawn is 349°
		The rift near the mid-point is at selenographic coordinates 24.5° N, 11.2° E, and occupies a diameter of about 9 km.
		See the reference table for the general listing of literature and web sites that were used in the compilation of this page.
	www.bookrags.com /wiki/Krishna_(crater) (210 words)

	Pagan Astronomy Network - Lunar Crater Project
		This movement allows astronomers to observe up to 59% of the surface rather then merely 50%.
		Although libration affects the positions of features on the surface, the selenographic system allows astronomers to refer to their mean apparent positions as a reference.
		His formulas involve gravity, density, a crater collapse factor, and the projectile's kinetic energy.
	paganastronomy.net /lunarcrater.html (2668 words)

	[No title]
		The colongitude describes the lunar longitude on the lunar equator where the sun appears to be rising.
		(It's common to always show a positive colongitude, however, so it would be reported as 270.) Near ^first quarter^, the sun is rising on the center of the near side, at lunar longitude 0, and the colongitude is therefore also zero.
		Near ^full moon^, the sun is rising near the eastern edge of the moon, at lunar longitude +90; and at ^last quarter^, it is rising as seen from the center of the far side of the moon, at lunar longitude 180.
	home.gwi.net /~pluto/help.txt (22565 words)

	Imaging the lunar surface
		The area of interest is shown in Figure 1 below, corresponding to Sirsalis crater.
		Fig.1 colongitude 65.38, The boxed area is Sirsalis crater.
		colongitude was 65.38 anddeg;, longitude and latitude selenographic was 3.89 and 3.75 anddeg; respectively.
	digilander.libero.it /gibbidomine/tlp.htm (1108 words)

	Galileo's Moon Drawings
		Now Whitaker is highly respected selenographer who has made many commendable contributions to his field based on detailed analysis of photos which he can undoubtedly date with great accuracy, but there seem to be some grounds for wondering whether he really has this ability when applied to Galileo's drawings.
		The Sun's colongitude, which is usually expressed on a scale from 0 to 360 degrees, increases at rate of about 0.51 degrees per hour, completing the circuit from one First Quarter Moon to the next in about 29.5 days.
		For a given solar colongitude it is quite possible for a particular feature north or south of the Moon's equator to be either in sunshine or in shadow depending on the latitude variation of the subsolar point.
	www.pacifier.com /~tpope/Moon_Page.htm (15536 words)

	Calculating the depth and diameter of lunar craters
		C) From the web http://www.xylem.demon.co.uk/kepler/jsmoon.html a print out of the "Sun's selenographic colongitude" was also taken which was used to find the length of was the shadow.
		I) Now we have the image, the latitude, longitude, time of the image when it was taken, the distance from Earth to the moon and the sun selenographic colongitude, size of the image in pixels and the diameter of the crater and the length of the shadow
		J) Measure the size of the crater by using a ruler.
	maguires.com /~maguires/astronomy/lunar_craters2.htm (1155 words)

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