A tutor to astronomie and geographie, or, An easie and speedy way to know the use of both the globes, coelestial and terrestrial in six books : the first teaching the rudiments of astronomy and geography, the 2. shewing by the globes the solution of astronomical & geographical probl., the 3. shewing by the globes the solution of problems in navigation, the 4. shewing by the globes the solution of astrological problemes, the 5. shewing by the globes the solution of gnomonical problemes, the 6. shewing by the globes the solution of of [sic] spherical triangles : more fully and amply then hath ever been set forth either by Gemma Frisius, Metius, Hues, Wright, Blaew, or any others that have taught the use of the globes : and that so plainly and methodically that the meanest capacity may at first reading apprehend it, and with a little practise grow expert in these divine sciences / by Joseph Moxon ; whereunto is added Antient poetical stories of the stars, shewing reasons why the several shapes and forms are pictured on the coelestial globe, collected from Dr. Hood ; as also a Discourse of the antiquity, progress and augmentation of astronomie.

PROB. XII.

The Altitude 〈◊〉〈◊〉 Sun, and Day of the Moneth given, to find the Hour of the Day.

AN Hour is the 24th. part of a Day and a Night, or the space of time that 15. degrees of the Equator takes up in passing through the Meridian; for the whole Equator which contains 360. degrees, passes through the Meri∣dian in 24. Hours, therefore 15. degrees which is the 24th. part of 360, pass through in one Hour. These Hours are Vulgarly divided into halfs, quarters, and half quarters; but Mathemati∣cally into Minutes, Seconds. Thirds, Fourths, &c. A Minute is the 60th. part of an Hour, so that 60, minutes make an Hour, 30, half an Hour, 15. a quarter of an Hour: A Second is the 60th part of a Minute: a third is the 60th part of a Second: a Fourth is the 60th part of a Third: and so you may run on to Fifths, Sixths, Sevenths, &c. if you please. 12. of these Hours make a Day, and 12. more make a Night: so that Day and Night con∣tain 24. hours as aforesaid▪ which are Volgarly numbred from Noon with 1, 2, 3, to 12, at Night▪ and then begin again with 1, 2, 3, till 12 at Noon: But by Astronomers they are Numbred from Noon with 1, 2, 3, &c. to 12. at Night; and so forward to 13, 14, 15, till 24; which is just full Noon the next Day. Yet in this Treatise I shall mention the Hours as they are Vulgarly co••••ted, viz. from 〈◊〉〈◊〉. after noon, to 12. at Night, and call the Hours after Midnight by 1, 2, 3, 4, &c. in the Morning, to 12. at Noon again, the next Day. But to the operation.

The Globe, &c. Rectified, Bring the Place of the Son to the Number of degrees of Altitude accounted upon the Quadrant of

Altitude, and the Hour-Index shall point at the Hour in the Hour-Circle: yet herein respect must be had to the Fore or After noons Elevation; as shall be shewed in the next Pro∣bleme.

Example.

May 10. The Sun is elevated 40. degrees above the Horizon, here at London: Therefore having found the Place of the Sun, by the third Probleme, to be ••29. I move the Globe and Quadrant till I can joyn the 29. degree of 〈◊〉〈◊〉 to the 40. deg, upon the Quadrant of Altitude; and then looking on the Hour-Circle, I find the Index point at 53. Minutes past 8. a clock, for the Fore noon Elevation; and at 3. hours 7. Minutes for the After noons Elevation. Therefore if it be Fore-noon, I say, It is 53. Minutes past 8. a clock in the Morning. But if it be After noon I say, It is 7. Minutes past 3. a clock in the After noon.

Notes

• An Hour defi∣ned.
• Minutes, Se∣conds, and Thirds, &c. defined.