Planetary lunar and stellar visibility

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Data available. The Astronomical Almanac chronology1767First edition of The Nautical Almanac and Astronomical Ephemeris, published by Astronomer Royal of England.1832British Nautical Almanac Office forms1834Greenwich Mean Time appears in the book.1849U.S. Nautical Almanac Office forms1855first edition of The American Ephemeris and Nautical Almanac1855Both countries now publish almanacs. 1855The US book publishes part of its data using a prime meridian in Washington DC as well as Greenwich. 1880'sSimon Newcomb begins developing new planetary theories and data. He was Superintendent of the US Nautical Almanac Office from 1877-1897.1882Both almanacs include ephemerides of more planets 1901UK book incorporates Newcomb's tables and constants; the US follows a few years later. 1912U.S book removes the Method of Lunar Distances from the book. The method of sight reduction is now the standard for navigation.1912U.S. Congress authorizes the international exchange of data and the official collaboration between the US and UK begins and continues today.1914Extract the marine navigation specific sections from the UK Astronomical Ephemeris and Nautical Almanac and publish separately as the UK Nautical Alamanc, abridged for the use of seamen. 1916U.S. book now includes data from France, Germany, Spain and Britain 1916Extract the marine navigation specific sections from The American Ephemeris and Nautical Almanac and publish separately as the U.S. Nautical Almanac 1919Sun/Moon rise/set times first appear 1925astronomers agree to start the astronomical day at midnight. 1934U.S. book uses Greenwich hour angle for Sun, Moon, stars. 1937First volume of the UK Air Almanac 1941Almanacs adopt FK3 as the international celestial reference system 1941first edition of the US Air Almanac 1950Almanacs add Pluto 1952The UK publishes The Abridged Nautical Almanac 1952Almanacs add minor planets 1-4 1952US book stops providing data using the prime meridian at Washington, DC 1953Almanacs discontinue use of Greenwich Civil Time 1960adopt ET - ephemeris time 1960UK and U.S. versions become identical in content, each producing about 50% of the content. 1961first edition of the Explantory Suplement 1968adopt the 1964 International Astronomical Union constants 1981Both almanacs change their name to The Astronomical Almanac 1981add the Stars and Stellar Systems Section 1984adopt the 1976 International Astronomical Union constants 1984replace ET with TDB - Barycentric Dynamic Time 1984adopt the DE200/LE200 Jet Propulsion Laboratory planetary ephemerides 2000remove the lunar polynomials 2002adopt TT - Terrestrial Time 2003adopt the DE405/LE405 Jet Propulsion Laboratory planetary ephemerides add ephemerides of several minor planets add table of selected x-ray sources 2004add tables of selected double stars and gamma ray sources remove the Besselian Day Numbers and Second Order Day Numbers. Replace the IAU1976 astronomical constants used in the computations with constants drawn from the IAU Best Estimates List, the IAU List of Cartographic Coordinates and Rotational Elements of Planetary Satellites, and the JPL DE405/LE405 ephemeris.

Space Tug/LM-Bs would be designed for a one-year in-space lifetime. Beginning in 1976, one Space Tug/LM-B would be based at the LEO SSM at all times for use in satellite servicing, spacecraft assembly, Earth-orbital rescue, and other missions.Image: NASA Marshall Space Flight Center.Early in 1976, a Saturn VC would launch a 50,000-pound SSM and a fully fueled Space Tug/LM-B to near-polar lunar orbit. During 1976, 1977, and 1978, nine Saturn VCs would launch four Space Tug/LM-Bs and five four-man "QCSMs" to the lunar-orbit SSM, enabling a continuous lunar population of four astronauts. The QCSM, which Grenning did not describe, would be an interim system like the Saturn VC. Two-man crews would land on the moon in Space Tug/LM-Bs four times in 1976, five times in 1977, and four times in 1978. Each trip to the lunar surface and back would expend 50,000 pounds of LN2/LOX propellants.The lunar-orbit SSM would keep two fully fueled Space Tug/LM-Bs on hand at all times. One would land on the moon and the other would stand by to rescue the surface astronauts in the event that their Space Tug/LM-B malfunctioned. After a year of operations, Space Tug/LM-Bs based at the lunar-orbit SSM would be stripped down and turned into tankage for a propellant depot in lunar orbit.Also in 1976, the Space Shuttle would fly eight times. Six Shuttle missions would deliver astronauts, supplies, and cargoes, including two automated planetary spacecraft, to the LEO SSM. The remaining two missions would see the Shuttle orbiter serve a "tanker" role. Each Shuttle would carry 50,000 pounds of LH2/LOX propellants, enough to refuel one Space Tug/LM-B.In Grenning's IPP, the shuttle was seen mainly as a personnel transport and a tanker. Image: MSFC.The first two missions of the Balanced Base planetary program, the Venus Explorer Orbiter and the Comet d'Arrest