152 ASTRONOMY. 



HARRISON (EDWARD). Idea longitudinis ; being a brief definition of 



the best known axioms for finding tho longitude. 8 London, 1696. 

 HARRISON (JOHN). Some account of the attempts for the discovery of 



the longitude by the Moon. See Harrison (!.) A description con- 

 cerning such mechanism, &c. 8 1775. (Miscellaneous.) 

 HASSENFRATZ (J. H.). Cours de physique celeste, ou lecons sur 1'ex- 



position du systeme du monde donnees a 1'Ecole polytechnique. 8 



Paris, an xi-1803. (Two copies.) 

 HASSLER (F. R.). A popular exposition of the system of the universe. 



8 New York, 1828. 



Plates and tables. Obi. 4 New York, 1828. 



HAUMONT (F. M.). L'astronomie, poeme didaetique latin ; en huit 



livres, avec la traduction francaise en regard et des notes. 8 Paris, 



1835. 

 HEATH (ROBERT). See Anonymous. General (a) and particular account 



of the annular eclipse, &c. 4 1764. 

 HEATHCOTE (R.). Historia astronomiae, sive de ortu et progressu 



astronomiae. 8 Cantabrigia, 1747- 

 HEDGCOCK (Tn.). Multum in parvo : a new work on astronomy, the 



magnet, tides, &c. 8 London, 1831. 

 HEDRTEUS (BENEDICTUS). Nova structura quadrantis astro- 



nomici. See Hedraaus (B.). Nova ac accurata astrolabii geometric! 



structura, &c. 12 1643. (Mathematics.) 

 HEINRICH (PLACIDUS). Monumentum Keplero dedicatum Ratisbonte. 



fol. [Ratisbonce, 1809.] 

 HEINSIUS (GODOFREDUS). De apparentiis annuli Saturni commentatio. 



4 Lipsiff, 1745. 

 HELL (MAXIMILIANUS). See Hallerstein (A.). Observationes astrono- 



micae Pekini factae. 4 1768. 



. De satellite Veneris. 8 Vienna, 1765. 



. Ephemerides anni 1757(-1791) ad meridianum Vindobonensem 



calculis definitse ; 35 vols. 8 Vindobonce, or Vienna, (1756)-! 790. 



Hell was assisted by several scientific men in compiling these ephemerides, which 

 were continued to 1793, and the names of his associates are mentioned in the titles 

 of the volumes to which they contributed. With the exception of the 1st and 7th 

 (for 1757 and 1763), the volumes contain appendixes on astronomical subjects 

 either by Hell or by other scientific men. It has therefore been deemed proper to 

 give the names of the contributors to each volume, as well as the title of the trea- 

 tises which have been occasionally added to them. 



An. 1758, in 2 pts. Adnexis observationibus astronomicis in Obser- 

 vatorio Caes. Reg. Vindobon. habitis anno 1757 ; (adjecta methodo 

 observandi congressus Lunae cum fixis et planetis, planetartim inter se 

 et cum fixis, typos horum congressman construendi, et ex his deter- 

 minandi loca apparentia Lunae et planetarum.) 



An. 1759 Adjectis observationibus astronomicis anni 1758, habitis in 

 Observatorio Caes. Reg. Universitatis Vindobon. 



An. 1760, in 2 pts. Adjectis observationibus astronomicis anni 1759, 

 habitis in Observatorio Caes. Reg. Universitatis Vindobon.; (adjecta 

 methodo observandi cometas ope micrometri filaris.) 



An. 1761 Adjectis observationibus anni 1760 habitis, &c.; and to 

 \vhich is prefixed] De singulari phaenomeno transitus Veneris per dis- 

 cum Solis die 5 Junii (1761). 



An. J762 Adjectis observationibus transitus Veneris per discum Solis 

 Vmdobonae et aliis Europae locis a viris in observando exercitatis 

 factis, cum elementis inde deductis, &c. 



