... Abstract Place the intersection of two double precision windows into a third window. ... Brief_I/O VARIABLE I/O DESCRIPTION -------- --- -------------------------------------------------- a, b I Input windows. c I Intersection of a and b. Detailed_Input a, b are CSPICE windows, each of which contains zero or more intervals. a and b must be declared as double precision SpiceCells. ... Files None. Author_and_Institution N.J. Bachman (JPL) H.A. Neilan (JPL) W.L. Taber (JPL) I.M. Underwood (JPL) . ...

Allows you to specify a drift scan: motion at a constant velocity along a great circle. ... The path starts at the new object position (though the telescope actually intersects the path later, see Subtleties ). ... Note that the units are always /sec for both axes. ... The velocity along the path is 0.01 /sec. ... The path is assumed to start when you hit the Slew button (more precisely, when the TCC parses the command). However, it takes the telescope awhile to slew to meet the specified path. ...

Define region . ... Area/perimeter . Define a region of interest on a graph or graphs. Select the region, there are 5. ... Inside polygon . Points inside a closed, non-intersecting polygon are considered inside the region. ... In the polygonal region type, define the region by successive clicks with the left mouse button, use the right mouse button to register the polygon. ... Select the region to use. ... Click on Area or Perimeter and use the mouse to define the region. ...

... The separation into branches is not real within the physical stream; it is an artifact of the fact that the Earth's path in space only intersects orbits with particular parameters: for a given size and shape of orbit, the argument of perihelion must take one of four values, corresponding to northern and southern branches, before and after perihelion. ... Assessments of the risk posed by near-Earth objects ignore the possibility of a giant comet entering the inner solar system. ...

Geographos . Geographos is classified as an Earth-crossing asteroid because its orbit can evolve to intersect Earth's orbit. ... The asteroids probably include several hundred objects larger than Geographos, thousands larger than half a mile across, and a few hundred thousand that are larger than a football field. ... Researchers obtained radar images of the asteroid on August 30, 1994, when the asteroid was 7.2 million kilometers (4.5 million miles) from Earth. ... Asteroids Vesta Mathilde . ...

Astronomy Picture of the Day . ... Credit: MOC Team , MGS , NASA Explanation: No, it's not breakfast ... but looking down from an orbiting spacecraft , the odd intersecting ridges covering this area of Mars do present a waffle-like appearance. ... The south polar region in this Mars Global Surveyor image measures about 8.5 by 12 miles and is spread with a layer of bright, seasonal carbon dioxide frost. ... Publications with keywords: Mars - south pole . Publications with words: Mars - south pole . ...

... March 20, 1998 . Mars: Ridges Near The South Pole . Credit: MOC Team , MGS , NASA . Explanation: No, it's not breakfast ... but looking down from an orbiting spacecraft , the odd intersecting ridges covering this area of Mars do present a waffle-like appearance. ... The south polar region in this Mars Global Surveyor image measures about 8.5 by 12 miles and is spread with a layer of bright, seasonal carbon dioxide frost. ... About APOD > . ... NASA Technical Rep.: ...

... gtibuild constructs an OGIP-compliant table of Good Time-Intervals (GTI) from a plain text description file. A complex fragmentation of the time-line may be described in terms of good and bad intervals, which may be simple or periodic. ... A periodic interval is a good or bad simple interval repeated through a whole number of periods. ... Having simple bad intervals together with a periodic bad interval in the same description file does not create the possibility of unexpected good time. ...

. F igure . 1. Metallicity function (left panel), and age distribution (right panel) for the old halo and thick disk globular clusters. Gaussian curves of different GC samples are seen to do not intersects almost. discussion in the text | next figure .

... Class . Use . ... FRAMES NO FRAMES All Classes . Packages that use PointRoi . ij.gui . Uses of PointRoi in ij.gui . Methods in ij.gui that return PointRoi . PointRoi . PointRoi. addPoint (int x, int y) . Returns a copy of this PointRoi with a point at (x,y) added. ... PointRoi. subtractPoints ( Roi roi) . Subtract the points that intersect the specified ROI and return the result. ...

. Artist s impression. An asteroid's orbit is altered as it passes close to Jupiter, Earth or Venus, such that its new orbit takes it near the Sun. The intense heat from the Sun causes the asteroid's surface to expand and fracture, and some of the material breaks off. As the surface material disintegrates, it creates dust and pebbles that spread out along the asteroid's orbit with time. If the orbit of the dust and pebbles ever intersects Earth, it can create a meteor shower. Karen Teramura, UH IfA

From a bird's eye view of the ecliptic, it is clear that Pluto's orbit is more eccentric than any other planet's. Pluto's orbit appears to intersect Neptune's, and for a period of about 20 years Pluto is slightly closer to the sun than Neptune. ... The libration of Pluto's orbit is due to an exchange of angular momentum with Neptune. When Pluto is "catching up" to Neptune, it gains angular momentum at Neptune's expense. ...

... Points in 3-dimensional space are in general position, if no four of them are in one plane. Two triangles in 3-dimensional space whose six vertices are in general position are linked if the outline of the first triangle intersects the interior of the second triangle exactly at one point. ... Then there exist two linked triangles with vertices at these points. ... Assume that the vertices of two triangles are in general position. ... And the vertices of these two triangles are in general position. ...

Our team was composed of a NASA scientist (Paul), sixth grade teachers in Glenarden, Maryland, two fifth grade teachers in Amherst, Massachusetts (Liliana and Tamara) and a Massachusetts high school teacher of home schooled students at Pathfinder Learning Center. ... One key part of the project is that the students need to know the Euclidean geometry fact that opposite interior angles formed by a line intersecting two parallel lines are equivalent. ... The teacher told him to show him what he knew. ...

... Bad Astronomy . ... Bitesize Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... If you said Pluto, sorry, that's incorrect. ... However, that's two-dimensional thinking; actually, the orbits are tilted and never intersect. ... Pluto has a very large moon named Charon, which revolves around Pluto in a very tight orbit (actually, the two both circle a common center of gravity). ... I have a small bit about Pluto in my Bad News section too! 2008 Phil Plait. ...

... It provides long range planning information to the scheduling team; it provides bright object, timing, and orientation information to the observation planning team; and it provides graphical description of the observations and their constraints. ... The GUI graphically displays the constraints that are computed by Spike and stored in the description files and in the database. ... BOAS processes all bright objects that have entered the database since the last time BOAS was run. ...