Places suitable for applying Halley's method

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442

My reasons for dwelling earnestly on the points at issue (foot-note) 443

Transit of 1882 .

Suggestions for applying the direct parallactic method

Tables referring to stations for observing transit of 1874:-

I. Places where ingress is accelerated

446

450

452

Subject of eclipses inadequately treated in text-books

Varying presentation of Moon's orbit towards Sun

Effects as respects occurrence of eclipses

Eclipse-seasons

Perturbations of the Moon's orbit

Eclipse-limits

Varying presentation of revolving circle (foot-note)
Penumbral lunar eclipses

Nature of the Earth's shadow-cone and the Moon's

Relative numbers of lunar and solar eclipses

Conclusion

TABLE I.

Principal solar elements

480

TABLE II.

For determining the effects of changes in value of solar parallax

on our estimate of the Sun's distance

V. Two views of a prominence by Zöllner (coloured)
VI. Daily views of the prominences by Respighi (coloured)
VII. The eclipsed Sun and corona, drawn by Gilman (coloured),
VIII. The Earth's passage through Venus's shadow-cone during
the transit of 1874

304

307

308

343

To face page 439

IX. The transit of 1874, ingress To face each other between

5. Aristarchus' method of measuring Sun's distance 6. Hipparchus'

7. Diagram

8. Orbits and conjunction-lines of Mars and the Earth 9. Measurement of Mars's distance

16

17

19

21

22

10. Orbits of Venus and the Earth

26

11. Transits of Venus (illustrating Halley's method) 12. Illustrating Delisle's method of observing transits 13. Diagram

29

34

38

33. The author's double automatic twice-acting battery

34. Prismatic analysis of the Sun's surface

38. How the spectroscope makes prominences visible

39. Spectroscopic exhibition of motions of recess or approach
40. Interpretation of distorted prominence-lines
41. Illustrating Dr. Wilson's theory of Sun-spots

. 135

135

136

. 137

138

(tangential slit)

171

. 179

180

. 190

. 219

. 220

. 221

. 222

46. Varying presentation of solar spot-zones

47. Sun-spot showing Nasmyth's willow-leaves

48. Large spot-group showing willow-leaves (Nasmyth)
49. Sun-spots showing penumbral rills (Secchi)
50. Sun-spots (Capocci)

58. Prominences seen during the eclipse of 1851 (Airy)

. 236 . 247

247 . 247

64. Chandelier prominence seen in 1860 (Goldschmidt)
65. Another prominence seen in 1860 (Goldschmidt)
66. Photograph of eclipsed Sun in 1860 (De la Rue)
67.

68. Illustrating distribution of prominences

. 256

. 257

. 260

(De la Rue)

69.

vast dimensions of

. 268

70. Eclipsed Sun, August 1868, photographed at Aden. 71. Spectrum of prominence and of solar limb

. 275

. 287

. 293

296

72. Widening of the hydrogen F-line in prominence-spectrum 73. Spectroscopic indications of solar cyclones

75. The first prominence seen by aid of spectroscope (Huggins) 76. Prominence seen by Huggins's method (Lockyer)

77. Same prominence ten minutes later

78. Prominences seen during American eclipse (1869)

79. Illustrating progress of Moon's shadow-cone during eclipse 80. The corona during eclipse of 1842

as photographed by Secchi in 1860
in 1860 (Feilitsch)

as drawn in 1868 at Mantawalok-Kekee
as photographed by Whipple in 1869

86. Diagram exhibiting incorrectness of
theory'

87. The Milky Way as a spiral

97. Parallactic displacement of Venus on Sun's disc 98. Varying presentation of Moon's orbit towards Sun 99. Illustrating effects of rotation and revolution 100. Diagram illustrating theory of eclipses.

PAGE

446

447

450

. 457

458

. 461

. 462

. 465

varying presentation of revolving circles 466 theory of eclipses .

.

470

477

477

477