... Current APO Weather . ... Search Site . ... Information for New Users . ... Technical Staff pages . Night Logs and Mailing Lists (maintained by APO) . ... Technical Documents and Database Search . ... Observer's Documentation and Procedures . ... Problem Reporting and APO Technical Documents Database Search . ... APO Drawing/Document Management Procedures . ... APO Technical Documents Database Search . Home Astrophysical Research Consortium . ... Mail Lists (maintained by APO) . ...

... 22.Reference Frames . ... Inertial Forces . 23a. The Centrifugal Force . ... The other case of a moving frame of reference studied here is an accelerated frame of reference. ... The roller-coaster car, however, is undergoing various accelerations, and as a rule, when we try to apply the laws of motion inside an accelerated frame of reference, extra forces enter the picture, known as inertial forces. ... That is the inertial force acting in the frame of the accelerating airplane. ...

... With enough velocity, a spacecraft can break loose from the Earth's gravity and enter an orbit around the Sun, like that of a planet. If it then orbits the Sun with the same period as the Earth--one year--it may keep a fixed position relative to Earth. ... If the distance is just right--about 4 times the distance to the Moon or 1/100 the distance to the Sun--the spacecraft, too, will need just one year to go around the Sun, and will keep its position between the Sun and the Earth. ...

... Binary orbits in the acceleration/period plane . Circular Orbits . ... We first present the equations for the period and acceleration of a pulsar in an eccentric binary system as a function of its position in the orbit. ... In Freire, Kramer & Lyne (2001) (from where most of this text and following equations are taken), we describe in more detail how circular binary orbits can be determined from the observed periods and accelerations of the pulsar. ... where is the orbital period of the binary. ...

SINGULAR POINTS IN THE SOLAR CHROMOSPHERE . ... In the structure of the solar chromosphere, containing information on the configuration of the magnetic field, we have found and identified all the main types of the singular points ( see Fig. 1 ), which are known as inherent features of the 2-D vector field. ... The main types of the singular points are the node, the focus, the center, and the saddle. ... Singular point of the focus type in the solar chromosphere. ...

... It turns out one possibility is a form of matter/energy invented by Einstein in the 1920s to make sure his equations of General Relativity did not predict the Expansion of the Universe. Although Einstein was willing to predict several things with his equations of General Relativity, he obviously thought an expanding Universe was too much, and so he invented the Cosmological Constant, which repels itself, and was meant to balance the force of gravity, and make the Universe static. ...

A limit on the ultra-high-energy neutrino flux from Centaurus A Justin Bray For the LUNASKA collaboration Clancy James, Ron Ekers, Chris Phillips, Paul Roberts, John Reynolds, Rebecca McFadden, Ray Protheroe, Jaime Alvarez-MuЯiz, Justin Bray Outline: Ї Ultra-high-energy (UHE) cosmic rays neutrinos Ї Detecting UHE neutrinos Ї The lunar Cherenkov technique Ї Observations with the ATCA Ї Observations with Parkes Ї ASKAP and the future ... Detection Geometry Neutrinos are penetrating.. ...

. The Alphabet Song . Be Kind . Bert and Ernie Singalong I . Bert and Ernie Singalong II . C is for Cookie . Can You Picture That? . Going Back Home . Happiness Hotel . I Hope That Something Better Comes Along . I Love Trash! . It's Not Easy Being Green . Just One Person . Lime in the Coconut . Movin' Right Along . The Rainbow Connection . Rubber Duckie . Theme to the Muppet Show . Go to Dan Turner`s Home Page . silk@remus.rutgers.edu

... Posts tagged ?point spread function? ... Thus, a major contributor to the LRF (Line Response Function) is the aforementioned scattering. ... controls the sharpness of the function ? ... Tags: beta profile , Chandra , EotW , Equation , Equation of the Week , Line Response Function , Lorentzian , LRF , point spread function , PSF , response matrix , RMF , XMM . ... Tags: ARF , effective area , EotW , Equation , Equation of the Week , LRF , point spread function , PSF , response matrix , RMF , source ....

Astronomy Picture of the Day . ... 26.11.2007 . ... Once a year, the Light Station at Pigeon Point near San Francisco , California , USA is lit as it was over 100 years ago. ... Early last week, light emanating from the Pigeon Point Lighthouse was particularly picturesque because of a thin fog, also blurring the distant Moon. ... November . ... November 2007 . ... 2007 2008 . ... NASA Web Site Statements, Warnings, and Disclaimers . ... U. Based on Astronomy Picture Of the Day . ...

... subroutine calcEllipseFromAngle(xSemi, ySemi, angleDeg, xVals, yVals) real(single), intent(in) :: xSemi, ySemi, angleDeg real(single), intent(out) :: xVals(:), yVals(size(xVals)) end subroutine calcEllipseFromAngle . ... The subroutine returns points evenly distributed in . ... subroutine calcEllipseFromPhase(xAmp, yAmp, phase, xVals, yVals) real(single), intent(in) :: xAmp, yAmp, phase real(single), intent(out) :: xVals(:), yVals(size(xVals)) end subroutine calcEllipseFromPhase . ...

Stellarium 0.12.3 . ... StelCircleArcRenderer Class Reference . Provides functions to draw circle arcs using StelRenderer . ... drawGreatCircleArc (const Vec3d &start, const Vec3d &stop, const SphericalCap *clippingCap=NULL, void(*viewportEdgeIntersectCallback)(const Vec3d &screenPos, const Vec3d &direction, void *userData)=NULL, void *userData=NULL) . ... Create a circle arc renderer to draw multiple circle arcs . ... void(*)(const Vec3d &screenPos, const Vec3d &direction, void *userData)  . ...

In this method the fields outside and inside a particle are represented by expansions in term of proper basis functions (practically always the vector spherical harmonics). Since the particle surface does not coincide with the coordinate surface, it is impossible to satisfy the boundary conditions exactly, and the expansions are limited by a finite number of terms, and the boundary conditions are considered in a finite set of points (matching points). ...

. Sensor data processing . Control laws . Outputs torque commands . Spline commands to reposition HGAs . Tracking uses HST and TDRSS ephemeris and pointing direction of vehicle to automatically track TDRSS . Battery state of charge and trickle charge calculations (health and safety checks) . Fixes SAA induced errors in FGS memory . Previous slide . Next slide . Back to first slide . View graphic version . Ъ

Operations in Point operations use the pointer to query sets about points, delete points in a set, and move points. In all cases where interaction is required, pressing the right mouse button with the pointer in the drawing area cancels the operation. ... Report on a point in a set . ... Press the left mouse button. ... Press Delete point with the left mouse button to activate. ... Move the pointer to the new location and press the left mouse button again to register the point's new location. ...

This all-sky image shows the spatial distribution over the whole sky of the galactic haze at 30 and 44 GHz, extracted from the Planck observations. In addition to this component, other foreground components such as charged particles accelerated radially, known as synchrotron radiation, thermal dust, spinning dust, and extragalactic point sources contribute to the total emission detected by Planck at these frequencies. ... ESA/Planck Collaboration ...

... Ignacio Ugarte Urra's PhD thesis topic is the investigation of coronal bright points. In his first paper (in collaboration with Gerry Doyle and Maria Madjarska) he investigated the formation, evolution and decay of a coronal bright point via a spectroscopic analysis of its transition region counterpart and the evolution of the underlying magnetic bipole during 3 days of almost continuous observations. ... In general the bright point has a radiance 4 times higher than that of the network. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2007 November 26 . Moon Over Pigeon Point Lighthouse . ... Once a year, the Light Station at Pigeon Point near San Francisco , California , USA is lit as it was over 100 years ago. ... Early last week, light emanating from the Pigeon Point Lighthouse was particularly picturesque because of a thin fog, also blurring the distant Moon. ...

Next: Average Up: Quick Guide Previous: Reduce the background data Contents . ... Load all data if you have sufficient memory (this may take a few moments). ... Use R EDUCE P OINT D ATA I MAGING PLOT to plot and edit the point data data in much the same way as you did with the background data. ... Use plots vs channel if you have to flag several entire channels. Use the PLOT A UTO option to automatically edit outliers in PhotonRate and VisSq (select all channels for speed). ...

Next: Context Levels Up: MIDAS Command Language Previous: Interrupting Procedures . ... In MIDAS, the ENTRY command defines entry points for different procedures in the same file. These individual procedures are executed by specifying also their entry point besides the file name in the `@@' command. ... DEFINE/PARAM P1 11 NUMBER "Enter input number: " . DEFINE/MAXPAR 1 ! only one parameter expected . ... DEFINE/PARAM P1 spiral IMA "Enter input image: " . ... DEFINE/LOCAL LOOP/I/1/1 0 . ...