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... 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. ...

An astronaut in low Earth orbit moves in (approximately) a big circle extending around the Earth. ... That can be interpreted as stating that in the astronaut's frame of reference, all bodies are subject to two forces, gravity and the centrifugal force, and the two are in perfect balance, adding up to zero. ... Wheel-shaped space . ... The science-fiction film "2001: A Space Odyssey" featured spinning space station, whose rotation provided the crew with "artificial gravity." ...

... 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. ...

. 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

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: · Ultra-high-energy (UHE) cosmic rays neutrinos · Detecting UHE neutrinos · The lunar Cherenkov technique · Observations with the ATCA · Observations with Parkes · ASKAP and the future ... Detection Geometry Neutrinos are penetrating.. ...

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)љ . ...

... 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. ...

... 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 . ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ... 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 . ...

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). ...

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. ...

specpsf -- Form a longslit spectrum for a point source from many point spread function images specpsf refima psfwavs psfims sliwid pixwid subsam cenoff psfpos outpsf . ... The name of the input 2-dimensional reference image to supply the dimensions and header information for the output longslit Point Spread Function (PSF) spectrum image. psfwavs = "" [table file name] . ... The centre of the Point Spread Function in each input image is determined by centroiding and the slit is placed over the image. ...

... 2001 February 19 . Shuttle Plume Shadow Points to Moon . ... Explanation: Why would the shadow of a space shuttle launch plume point toward the Moon? ... Next, just at sunset, the shadow is the longest and extends all the way to the horizon . ... Therefore, as Atlantis blasted off, just after sunset , its shadow projected away from the Sun toward the opposite horizon, where the Full Moon just happened to be. ... About APOD | ...

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. ...

... Bad Astronomy . Misconceptions . ... Bad Astronomy : The Moon only shows one face to us because it is not rotating. Better astronomy : The Moon only shows one face because it is rotating, once every time it revolves around the Earth. ... Place the Moon model on the table about 30 centimeters (one foot) away with the X facing the Earth model. ... You'll see that to keep the X facing the Earth model, you have to rotate the Moon model as it goes around the Earth model . ... 2008 Phil Plait. ...

Midday line determination by means of gnomon. At midday the shadows of all the objects are directed along the line pointing exactly from the South to the North. ... At one or two hours before midday mark the shadow edge from the pole with the help of a peg. ... Using the free part of the cord as a circle draw a circumference coming through the peg. ... A straight line coming through the middle of the line, connecting the first and the second peg and the base of gnomon is a midday line. ...