D

Dactyl, 320

Darius III, king of Persia, 18 Dark Ages, 360-361, 371 Darwin, Charles, 105, 106 Day, length of (LoD), 89, 147-149, 157, 163

Declaration of Independence, 178,

180, 189 Deimos, 202, 255, 314 Delawares, 191, 192 De Vico, Francesco, 232 Diamond ring effect, 10, 11, 181,

224, 337, 437 Diffraction, 249 Dion Cassius, 68

Dionysius Exiguus, 366-368, 369, 370, 371, 376-377

Dionysus, 320 Dixieland, 293-295 Dixon, Jeremiah, 293-294, 296 Doom, eclipses as portents of, 4-5,

23-25, 26-27 Doppler effect, 251, 321 Dunkin, Edward, 338 Dunsink Observatory, 263 Durham, University of, 155 Dyson, Sir Frank, xv, 113, 119

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