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

446

450

Tables referring to stations for observing transit of 1874:-

I. Places where ingress is accelerated

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

Number of eclipses in eclipse-seasons

Number of eclipse-seasons in a year

Another mode of dealing with the subject

Nature of the Earth's shadow-cone and the Moon's
Relative numbers of lunar and solar eclipses
Conclusion

For determining the effects of changes in value of solar parallax

on our estimate of the Sun's distance

307

308

343

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

To face page 439

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

4. Illustrating measurement of Moon's distance

5. Aristarchus' method of measuring Sun's distance

8. Orbits and conjunction-lines of Mars and the Earth

9. Measurement of Mars's distance

19

21

22

FIG.

14. Diagram

15. Venus pear-shaped, &c

16. Diagram

50. Sun-spots (Capocci)

51. Solar granules (Huggins)

24. The heat, light, and actinic spectra

25. Dispersion of light through a battery of prisms

26. Diagram illustrating effects of dispersion

27. Diagram

28. A battery of prisms

29. Browning's automatic contrivance

30. A modification of same

31. Direct vision prism

32. Twice-acting battery

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

.

48. Large spot-group showing willow-leaves (Nasmyth)

49. Sun-spots showing penumbral rills (Secchi)

52. Solar leaf-stalks (Secchi)

225

53. Remarkable Sun-spot (Secchi)

. 226

51. Views of the great spot of 1865 (Howlett)

. 230

FIG.

55. Faculæ near a Sun-spot (Chacornac)

56. Sun-spot indicating cyclonic action (Secchi)

57. Peculiarities in spectrum of Sun-spot

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

PAGE

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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

(Stephenson)

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. 256

. 257

. 260

(De la Rue)

. 260

. 265

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

. 275

. 287

77. Same prominence ten minutes later

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)

78. Prominences seen during American eclipse (1869)

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

81. The corona in 1858 (Liais)

293

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. 299

. 301

. 302

. 303

. 311

. 317

. 324

. 326

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.

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. 461