Meteorological Observations foi- May 1831. 79 



Tlie planet Mercury was seen here with the naked eye in the fine even- 

 ings, from the 1st to tiie 13th; and Venus was seen at neon of the 16th, 

 notwithstanding she is still in the superior part of her orbit. 



The atmospheric and meteoric phsenomena that have come within our 

 observations this month, are one solar and (wo lunar halos, two meteors, 

 one rainbow, one aurora borealis, lightning and thunder on the 5th, distant 

 thunder on the 24tli, and four gales of wind, namely, two from the North- 

 east, and two from the East. 



Occultation of Jupiter and his Satellites by the Moo7i. — The following 

 were the apparent astronomical times here, on June the 1st, when the 

 immersions and emersions of Jupiter and his Satellites occurred, with the 

 exception of the 4th Satellite, the times of whose immersion and emersion 

 are given by approximation. 



IJtMERSIONS. 



The 4th Satellite at... 12M0"48» 



The 1st Satellite at... 12 57 50 



Jupiter's western limb at 12 59 49 



Jupiter's centre at 13 1 45 



Jupiter's eastern limb at 13 3 42 



The 2nd Satellite at... 13 6 10 



The 3rd Satellite at... 13 10 41 



EMERSIONS. 



The 4th Satellite at ... 13" 49" 6' 



The 1st Satellite at ... 14 6 10 



Jupiter's western limb 14 7 50 



Jupiter's centre at 14 9 47 



Jupiter's eastern limb at 14 11 45 



The 2nd Satellite at ... 14 12 25 



The 3rd Satellite at ... 14 17 43 



The occultation of Jupiter lasted 1 hour 8 minutes 3 seconds. From 

 the motion of the Satellites the times of their occultations do not exactly 

 agree with that of their primary. 



Jupiter was not so nicely dichotomized on the Moon's enlightened limb 

 as on her dark side : and after his emersion he appeared with an apparently 

 enlarged disc, and shone more brilliantly than before his immersion, as well 

 as his Satellites. 



REMARKS. 



London. — May 1. Cloudy: showers. 2. Heavy rain, with thunder. 

 S. Showers: fine at night. 4. Showers, with intervals of bright sun. 

 5. Fine in the morning: showers : clear and cold at night. 6. Fine: cloudy: 

 clear at night, with severe frost for the advanced state of vegetation. 

 7, 8. Fine : frosty at nights. 9 — 13. Fine, but cold and very dry. 14. Fine: 

 slight frost at night. 15, 16. Fine. 17, 18. Very dry. 19. Fine : rain at 

 night. 20. Cloudy: heavy thunder shower in the afternoon. 21, 22. Over- 

 cast. 23. Cloudy: thunder in the afternoon. 24. Fine: dull and hazy, 

 with thunder at night. 25—28. Fine. 29. Wet. 30. Cloudy: fine. 

 31. Foggy in the morning : fine. 



Penzance. — May 1. Fine. 2, 3. Clear : showers. 4,5. Fair : hail showers. 

 C— 8. Fair. 9, 10. Clear. 11. Pair. 12, 13. Clear. 14, 15. Fair. 

 16. Clear. 17. Fair. 18. Clear: a shower. | 19. Fair : rain. 20. Fair. 

 21. Clear. 22. Fair. 23. Fair: foggy. 24. Foggy: fiur. 25. Fair. 

 2C. Fair: rain at night. 27. Rain. 28. Fair: rain. 29. Rain. ru). Fair: 

 rain. 31. Rain. 



2/o«/on. — May 1. Fine. 2. Cloudy. 3. Rain. 4. Cloudy: rain a.m. 

 and P.M. 5. Fine: rain P.M. 6, 7. Fine. 8. Cloudy. 9 — 12. Fine. 

 13 — 15. Cloudy. 16— 19. Fine. 20, Cloudy: shower p.m. 21. Cloudy. 

 2'^. Fine. 23. ( 'loudy : rain, with thunder and ligiitiiing early a.m. 24. Fine. 

 25. Cloudy. 26. Fine. 27 — 30. Cloudy. 31, Fine. 



Meteoro- 



