Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
		1      188 years ago, in 1770: Comet D/1770 L1 (Lexell's Comet), passes 0.015AU's from Earth (1.4 million miles, 2.3 million km's).      139 years ago, in 1819: Johann Georg Tralles in Germany discovers Comet Tralles (C/1819 N1, Great Comet of 1819).	2	3	4      904 years ago, in 1054: Chinese astronomers make the first recorded observation of supernova SN 1054; its remnants are the Crab Nebula.	5      271 years ago, in 1687: Isaac Newton's Philosophiæ Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy) is first published.
6      20 years ago, in 1938: Seth Barnes Nicholson discovers one of Jupiter's moons, Lysithea.	7	8      116 years ago, in 1842: Francis Baily of the United Kingdom, at an eclipse in Italy, focuses attention on the corona and prominences and identifies them as part of the Sun's atmosphere.	9	10	11	12
13	14	15	16        This year: Congress passes the National Aeronautics and Space Act of 1958.	17      694 years ago, in 1264: Japanese observers are the first to view the Great Comet of 1264 (C/1264 N1).      1624 years ago, in 334: Julius Firmicus Maternus of the Roman Empire makes the first recorded observation of solar prominences during an annular eclipse	18	19      1540 years ago, in 418: The historian Philostorgius in Asia Minor makes the first report of a comet discovered during a solar eclipse.
20	21      44 years ago, in 1914: Seth Barnes Nicholson discovers one of Jupiter's moons, Sinope.	22      7 years ago, in 1951: Dezik and Tsygan, launched aboard a Soviet R1, are the first dogs to make a sub-orbital flight (both survived).	23	24	25	26      349 years ago, in 1609: Thomas Harriot becomes the first person to make a drawing of the Moon through a telescope.        This year: Explorer 4 is launched for further study of the Van Allen Belts.
27	28      107 years ago, in 1851: The first correctly exposed photographic image of a solar eclipse, a daguerreotype, is made by Julius Berkowski at the Royal Observatory in Konigsberg, Prussia.      39 years ago, in 1919: The International Astronomical Union (IAU) is founded at the Constitutive Assembly of the International Research Council .	29        This year: The National Aeronautics and Space Act (NASA) is signed into a law by President Eisenhower.	30      42 years ago, in 1916: 951 Gaspra, an S-type asteroid orbiting close to the inner edge of the asteroid belt, is discovered by the Russian astronomer G. N. Neujmin.      20 years ago, in 1938: Seth Barnes Nicholson discovers one of Jupiter's moons, Carme.	31