Results 151 to 160 of about 1,344 (186)

NASA's future plans for lunar astronomy and astrophysics

Advances in Space Research, 1994
Based on the recommendations of The Decade of Discovery in Astronomy and Astrophysics — a report from the National Research Council’s Astronomy and Astrophysics Survey Committee (chaired by John Bahcall) — NASA’s Astrophysics Division crafted a strategic plan consisting of missions and other programme elements to begin development within the next ten ...
Robert V. Stachnik, Michael S. Kaplan
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Lunar Radio Astronomy Observatory

1966
Lunar Eadio Astronomy Observatory. Terrestrial, orbital and lunar environments are compared from the radio-astronomical point of view. The terrestrial environment is limited at long waves by the ionosphere, atmospheric noise and man-made interference. The centimeter and shorter waves are plagued by atmospheric absorption and radiation.
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Studies in Ancient Astronomy. VII. Magnitudes of Lunar Eclipses in Babylonian Mathematical Astronomy

Isis, 1945
Teil IV, s. [Quell. Stud. Gesch. Math. B 4, 383--406 (1938; Zbl 0019.09902, JFM 64.0009.01)]. Anschließend an ,,Untersuchungen zur antiken Astronomie. III [Quell. Stud. Gesch. Math. B 4, 193--346 (1938; Zbl 0018.04901, JFM 64.0008.04)] des Verf. werden die Untersuchungen über Einzelprobleme der babylonischen Astronomie fortgesetzt. Es ergibt sich dabei
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Lunar Orbit Design of a Satellite Swarm for Radio Astronomy

2020 IEEE Aerospace Conference, 2020
Employing a satellite swarm for radio astronomy has been continuously addressed in the Orbiting Low Frequency ARray (OLFAR) project. A 100 km diameter of aperture array constructed by distributed satellites will be able to provide sky maps of better than 1 arc-minute spatial resolution at 10 MHz.
Mok, S. (author), Guo, J. (author), Gill, E.K.A. (author), Rajan, R.T. (author)   +3 more
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Two-dimensional aperture synthesis in lunar radar astronomy

Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1968
Abstract It is shown that when a distant object such as the Moon or a planet is observed by a continuous wave (c. w.) radar employing a single aerial, components of the two-dimensional Fourier transform of the target’s radar brightness distribution may be obtained by computing the autocorrelation function of the complex amplitude of ...
J. H. Thomson, J. E. B. Ponsonby
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Lunar eclipse picture bags astronomy prize

Physics World, 2019
Hungarian photographer László Francsics has beaten thousands of amateur and professional rivals from around the world to win the 2019 Insight Investment Astronomy Photographer of the Year.
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A Lunar-Base Lab for Geology or Astronomy Courses

Journal of Geoscience Education, 1997
Based on long-term economic and technological trends, it is likely that lunar bases and related space activities will be a prominent feature of the early 21st century. The lunar-base lab featured here uniquely introduces students to the key elements of lunar geology by immersing them in the excitement of planning humanity's future on the Moon. Five (or
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A New and Extended Case for Lunar (and Solar) Astronomy at the Newark Earthworks

Midcontinental Journal of Archaeology, 2013
The Middle Woodland period Newark Earthworks in Newark, Ohio, are the largest known set of connected, geometrical earthworks ever constructed. An analysis of available evidence (survey, topographi- cal, statistical, and archaeological) shows that the geometry of this Hopewell complex and its relation to the surrounding terrain can be understood in ...
Ray Hively, Robert Horn
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The Lunar Observer radio astronomy experiment (LORAE)

2008
We propose to place a simple low frequency dipole antenna on board the Lunar Observer (LO) satellite. LO will orbit the Moon in the mid-1990's, mapping the surface at high resolution and gathering new geophysical data. In its modest concept, LORAE will collect crucial data on the radio interference environment while on the near-side (to aid in planning
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Analysis of the Radio Astronomy Explorer lunar orbit mission

Astrodynamics Conference, 1972
The second Radio Astronomy Explorer spacecraft (RAE-B) is planned to be inserted into lunar orbit in 1973. The transfer trajectory design, lunar orbit selection and launch opportunities are developed in relation to the spacecraft mass properties, propulsion capability and the scientific, environmental and engineering constraints. Alternative midcourse
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