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2fi. To find the two Days on which the Sun is in the Zenith

oi apy given Place, dec 255

27. To find where the Sun is vertical on a given day and

Hour ibid.

28. At a given Time of the Day in one Place, to find at the

same Instant those Places where the Snn is rising, set-

ting, &c 256

29. To find all those places within the Polar Circles, on which

the Sun begins to snine. &c 2">7

30. To make Usv <>f the Globes as a Tellurian 259

31. To rectify the Globe to the Latitude and liorizon of any

Place 262

32. To rectify for the 'Sun's Place ibid.

33. To rectify for the Zenith of any Place: 263

Of exposing the Globe to the Sun ibid.

34. To observe the Sun's Altitude 266

35. To place the Globe, when exposed to the Sun, that it may

represent the natural positions of the Earth 268

36. To find naturally the Sun's Declination 27O

37. To find naturally the Sun's Azimuth 271

38. To shew where the Sun will be twice on the same Azimnth

in the Morning, and twice in the Afternoon ,. 272

39. To find the Hour by the Sun 273

Of Dialling. 279

40. To construct an Horizontal Dial 283

41. To delineate a South Dial . .^ 286

42. To make an erect Dial 287

Of Navgition 291

43. Given the difference of Latitude, and difference of Longi-

tude, to find the Course and Distance sailed 297

44. Given the difference of Latitude and Course, to find the

difference of Longitude, and Distance sailed ibid.

45. Given the difference of Latitude and Distance run, to

find the difference of Longitude, and Angle of the

Course 298

46. Given the difference of Longitude and Course, to find the

diflerencc of Latitude, and Distance sailed 299

1-ROB. PACE

47. Given the Course and Distance, to find the diflerence of

Longitude and Latitude / 310

48. To steer a Ship upon the Arch of a Great Circle, &c... 301

Of the Terrestrial Globe, mounted in t.ie common Manner. . 303

Pros. '.

1. To find the Latitude and Longitude of any given Place on

the Globe 304

2. ,To find the difference of Longitude between any two given

Places ibid.

3. To rectify the Glob* for the Latitude, Zenith, aud Sun's

Place "305

4. The Hour of the Day at any Place being given, to find all

those on the Globe, where it is Noon, Midnight, or

any given hour at that tiirie ibid.

5. The Hour of the Day at any Place being given, to find the.

correspondent Hour (or what o'clock it is at that time)

in any other Place .'.. 306

6. The Day of the Month being given, to find all those

Places on the Globe where the Sun will be vertical, or

in the Zenith, that Day 307

7. A Place being given in the Torrid Zone, to find those two

Days of the Year on which the Sun will be vertical to

that Place.... ,. ibid.

X. To find the Antoeci, Perioeci, and Antipodes of any given

, PJuce 308

9. To find at what Hour 'the Sun rises and sets ajiy Day in

the Year, at any Place, and also upon what Point of

the Compass 309

10. To find the length of the Day and Night at any time of

the"Year ibid.

11. To find the length of the longest or shortest Day, at any

Place upon the Earth 310

12. To find all those inhabitants to whom the San is this mo.

ment rising or setting, in their Meridian or Midnight.. 311

13. To find the beginning and end of Twilight 312

Of the Use of the Celestial Globe, mounted in the common

manner '... 314

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