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Sic spatio viginti quatuor horarum aqua non bis ut fieri solet
sed semel tantum perveniet ad maximam altitudinem et semel ad minimam;
Et altitudo maxima, si luna declinat in polum supra horizontem loci,
Incidet in horam vel sextam vel tricesimam ab appulsu lunae ad meridianum,
Atque luna declinationem mutante mutabitur in defluxum.

Quorum omnium exemplum in portu regni Tunquini ad Batsham sub latitudine boreali 20˚ 50’.
Halleius ex nautarum observationibus patefecit.
Ibi aqua die transitum lunae pere aequatorem sequente stagnat,
Dein luna ad boream declinante incipit fluere et refluere,
Non bis, ut in aliis portubus,
Sed semel singulis diebus;
Et aestus incidit in occasum lunae,
Defluxus maximus in ortum.

Thus in the space of twenty-four hours, the water will only once reach its greatest height, not twice as usually happens, and will only once reach its least height; and the greatest height, if the moon is declining toward the pole above the horizon of the place, will occur at either the sixth or the thirtieth hour after the appulse of the moon to the meridian; and when the moon changes its declination, this flood tide will be changed into an ebb tide. And example of all these things has been given by Halley, on the basis of sailors’ observations, in Batsha harbor in the kingdom of Tonkin at the latitude of 20˚50’ N. There the water stays still on the day following the transit of the moon over the equator; then, when the moon declines toward the north, the water begins to ebb and flow—not twice, as in other harbors, but only once every day; and the flood tide occurs at the setting of the moon, and the greatest ebb tide at its rising.

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from De Mundi Systemate .​.​. Sir Isaac Newton (2021), released April 12, 2021

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Thomas Oboe Lee Cambridge, Massachusetts

Thomas Oboe Lee was born in China in 1945. He lived in São Paulo, Brazil, for six years before coming to the United States in 1966. After graduating from the University of Pittsburgh, he studied composition at the New England Conservatory and Harvard University. He has been a member of the music faculty at Boston College since 1990. ... more

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