... 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