All which seem to favour the Accumulation and Descent of warm Air, by Waves of the Apogay rolling over the Eknèfiai Winds.
CHAPTER LII.
Proper Days in the Month for the Ascent of Balloons.
Section 285.AS the safest Hour of the Day has been already pointed out, for the Ascent of those Aironauts, who propose to cross a Channel, or Arm of the Sea, in a Balloon Air-tight or nearly so: it may not be useless to throw out a few Hints on the properest Days in each Month, for the Ascent of Balloons.
286. It will perhaps be found true, that the more frequent Winds are generated near the Surface of the Earth: but that Storms are generated from above. Cold, Heat, Drought, and Moisture produce the more frequent and diurnal Winds: but the Conjunctions and Operations of the Moon and Planets contribute to the Production of Storms and other Inequalities of the Atmosphere: more especially the Moon: at the New and Full. These Attractions first affect the superior Parts of the Atmosphere.[89]
287. “We are sure in the calmest Weather, to have some Breeze at Noon, and at full Tide.” Therefore, both are improper Times for Balloons to be at Sea: the Time of low Water and Midnight woud be best in those, if equal in other Respects.
Changes of Weather as to Wind or Calm happen about the New and Full Moon.[90]
288. Varieties of Tide produced by the united or divided Forces of the Sun and Moon, occasion similar Changes in the Atmosphere nearly at the same Time.
For Instance, at the Time of the New Moon or Conjunction, i. e. when the Earth, Moon, and Sun, are nearly in a Line; the Moon being between them: also at the Time of the Full Moon; i. e. when the Moon, Earth, and Sun are nearly in a Line; and the Earth between them, which is called the Opposition.[91]