464 TRANS. ST. LOUIS ACAD. SCIENCE. 



5Jt.. O -|-3^6» Dec. 30th, i9h. 30m., ft 2° W., Constantinople, 

 curve 13°, — 2°, 25°. Aurel. Victor (Caes. xli. i) reports that a 

 short time after Diocletian's death, which happened a.d. 316, 

 Dec. 3d, a partial eclipse of the sun occurred in Constantinople 

 (quod — defectu solis foedato iisdem mensibus die patefactum est.) 

 Calvisius had reference to the eclipse a.d. 316, July 5th, i7h., U 

 o°E., curve 20°- 36°, 35°, 27° ; obscuration in Constantinople 5 

 inches. This eclipse, however, did not " follow," but preceded, 

 Diocletian's death, and, since the W lay (p. 429) 2° 36' west of 

 the sun, no solar eclipse was visible in Constantinople. On occa- 

 sion of the aforesaid eclipse, a.d. 316, Dec. 30, the corrected place 

 of the U was 4° 26' W., and the obscuration of the sun, visible in 

 Constantinople, was very great. 



00. O +317, Dec. 20th, ih., ft 11° W., Constantinople, curve 

 Eur., Afr. Idatius (in Scaliger's Thes. p. 30, ed. Roncall. p. 10) 

 reports that, coss. Val. Licinian. Licinus Aug. V. and Fl. Jul. 

 Crispus Caesar, a.d. 317, a solar eclipse occurred three hours prior 

 to sunset in Constantinople (tenebrae fuerunt hora nona). Peta- 

 vius referred this eclipse to a.d. 317, Dec. 20th, ih. ft 11° west, 

 obscuration 7 inches. Indeed, this eclipse happened in Constan- 

 tinople three hours past noon (p. 429), but the obscuration was 

 greater, the longitude of the ft being shorter by about 2° 36'. 

 This result agrees with Idatius's words, "tenebrae fuerunt," and 

 confirms our Table, p. 429. 



06. 04-324, August 6th, 2h., ft 4'' W., Campania, curve 

 40-20°, Eur., Afr. Cedrenus (p. 285 Par.) recounts that, coss. 

 Crispus and Constantinus III.., a.d. 324, a total eclipse of the sun 

 occurred in the afternoon {fj/J.ou ixXei<^{^ TOiauTT], wc davipa^ 

 (pavy^vac iv ^fxspff), Calvisius, agreeably to the present lunar 

 theory, stated this eclipse to have been partial, for the reason that 

 only seven inches of the southern limb of the sun were covered. 

 According to our Table, p. 429, however, the longitude of the ft 

 was shorter by about 2° 36' , and hence the obscuration of the sun 

 must have been a total one in Campania about 4 o'clock p.m. 



57. O +334, July i6th, 23h. 30m., U 2° E., Rome(.?), curve 

 42°, 40°, 5°. Firmicus (Astron. i. 2) informs us that "sol medio 

 diei tempore — cuncta mortalibus fulgida splendoris sui denegat 

 lumina, quod Optati et Paulini consulatu — mathematicorum sa- 

 gax praedixit intentio." Petavius computed the eclipse a.d. 334, 



