H Hale, G. E., 55, 57, 233. Hall, A., 96, 111, 112, 156, 190. Hall, Maxwell, 121. Halley, E., 138. Halley’s comet, 123, 130, 152. Halm, J., 195, 196. Hansen, P. A., 61, 78, 79. Hansky, A., 57. Harding, K. L., 99, 153, 220. Hartwig, E., 190. Harvard Observatory, 174, 175, 191. Hasselberg, B., 148, 190. Heis, E., 179, 220. Heliometer, 153, 157. Helium stars, 174. Helmholtz, H., 61, 229. Hencke, K. L., 99. Henderson, T., 154, 155. Henry, Paul and Prosper, 100, 114, 210. Hercules, 167. Herculis (α), 182. Herculis (λ), 26. Herschel, William, 1-42, 43, 60, 63, 65, 69, 74, 77, 85, 90, 99, 103, 109, 111, 112, 115, 123, 150, 162, 167, 176, 196, 197, 207, 214, 216, 218, 224, 227. Herschel, A., 144. Herschel, Caroline, 6, 8, 9, 12, 13, 14, 30, 35, 127, 198. Herschel, Sir J., 4, 17, 27, 30, 37, 50, 112, 113, 120, 130, 144, 167, 187, 188, 197, 198, 199, 200, 214, 215. Hind, J. R., 99, 129, 135, 180, 188. Hoek, 135. Holden, E. S., 191. Hough, G., 105. Houzeau, J. C., 220. Huggins, Lady, 172. Huggins, Sir W., 54, 57, 74, 95, 106, 114, 131, 136, 165, 170, 171, 172, 173, 189, 190, 191, 193, 195, 207, 208, 212, 231. Humboldt, A., 44, 139. Hussey, W. J., 116, 201. I Innes, R., 188. Intra-Mercurial planet, 80, 81. Italian spectroscopists, 54, 55. J Janssen, P. J. C., 52, 53, 54, 57, 59, 112, 209. Juno, 19, 99, 101. Jupiter, 20, 75, 97, 101-108, 112, 114, 121, 122, 135, 144, 146. Juvisy Observatory, 164. K Kaestner, 65, 124. Kaiser, F., 90. Kant, I., 34, 35, 101, 103. Kapteyn, J. C., 27, 158, 161, 162, 168, 221, 222. Keeler, J. E., 95, 114, 185, 208, 211, 212, 213, 231. Kelvin, Lord, 229. Kempf, P., 181. Kepler, J., 5, 35, 137. Kirchoff, G. R., 61, 169, 172. Kirkwood, D., 140, 230. Klein, H. J., 73. Klinkerfues, E., 142, 202. Konkoly, N., 175. Küstner, F., 88.