41. Lunar Libration - an Astronomy Net Article
... Lunar Libration . Libration is the slight rocking motion of the moon.. ... Actually, a slight rocking motion, called libration,* makes about 59% of the Moon's surface visible from our planet Earth ...
43. ASP: This Restless Globe
... A Look at the Motions of the Earth in Space and How They Are Changing . ... The Major Motions of the Earth . How These Motions Are Changing . ... How These Motions Are Changing . The Orientation of the Earth in Space . ...
44. G4.5+6.8
... to the N. Distance: Optical expansion and proper motion indicates about 2.9 kpc, H I ... van den Bergh & Kamper 1977, ApJ, 218, 617. Optical proper motions. ADS . ... 2008, ApJ, 689, 225. Chandra proper motion studies. ADS . Vink et al. ...
45. S.P. Korolev RSC Energia - International Space Station
... Crew logbook with a set of questionnaires "Motion perception", in which the astronaut should document his motion sensation and nature of discomfort experienced in the course of his daily activity and associated with the space adaptation syndrome . ...
48. Abstract
... In the case that the wave motion is excited at M=0.001 (M is the piton Mach number), the almost steady oscillation state is shock free and the pressure profile, except for maximum amplitude, agrees with that of the linear quasi-one-dimensional wave motion ...
49. NICMOS Observes the Galactic Center
... Abstract: . Introduction . Proper Motion Studies . Variability Studies . Observations of P . ... The suite of observations include those aimed at measuring proper motions, at determining the spectral type at the tip of the ...