## Spherical trigonometryJ. Noon, 1736 - Plane trigonometry |

### Common terms and phrases

adjacent Angle againſt alfo alſo Ambiguity Analemma Analogy Arch Azimuth Bafe Baſe becauſe BIFH Cafe Center Co-fine Co-tangent Colure Compaffes Complement confequently ctBC Declination defcribe Demonftration Dial Diameter Difference Diſtance E. D. THEOREM Eaft Ecliptic equal Equinoctial faid fhall fhew find the Angle find the Hypothenufe find the Leg find the Side firſt folving fuch fuppofe Globe greater greateſt half Sum Half-Tangent Horizon Hour-Lines Houſes Inftrument Interfection laft Latitude lay a Ruler leffer lefs Leg AC Longitude meaſured Meridian muft muſt Numbers obferve Oblique Circle Parallel Perpendicular Pofition Pole Prime Vertical Primitive Circle Prob PROBLEM Projection Quadrant Radius Right Afcenfion Right Circle Right Line Right-angled Spherical Triangles Semicircle ſhall Sine of half Sphere Spherical Angle Spherical Trigonometry Sun's Tangent of half thefe theſe thofe thoſe Tropic of Capricorn Weft Wherefore whofe

### Popular passages

Page 75 - The three angles of a spherical triangle are together greater than two right angles and less than six right angles. Let A, B, C be the angles of a spherical triangle ; let a', b', o' be the sides of the polar triangle. Then by Art. 30, a...

Page 185 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.

Page 186 - The cosine of half the sum of two sides of a spherical triangle is to the cosine of half their difference as the cotangent of half the included angle is to the tangent of half the sum of the other two angles.

Page 186 - The cosine of half the sum of two angles of a spherical triangle is to the cosine of half their difference as the tangent of half the included side is to the tangent of half the sum of the other two sides.

Page 186 - The sine of half the sum of two angles of a spherical triangle is 'to the sine of half their difference as the tangent of half the included side is to the tangent of half the difference of the other two sides.

Page 241 - It commences in the morning and ends in the evening, when the sun is 18° below the horizon.

Page 5 - Equinoctial (counted from the beginning of Aries) which cometh to the Meridian with the Sun or Stars, or with any portion of the Eclyptick.

Page 365 - Dialogue, adapted purpofely to the Capacities of the Youth of both Sexes ; and adorned and illuftrated with variety of Copper- Plates.

Page 75 - Side *»» is the Supplement of the Angle H, and the Angle E of the Side G D.

Page 205 - Superficies to M ; And, as two right Angles are to F, So is half the fpherical Superficies to K.