Flint, star-parallaxes, [417]
Fontana, mountains of Venus, [252];
satellite, [256]
spots on Mars, [274]
Forbes, George, trans-Neptunian planets, [306] [307]
Forbes, James D., spectrum of annularly eclipsed sun, [134];
solar constant, [225]
Foucault, spectrum of voltaic arc, [137];
photograph of the sun, [153]
velocity of light, [232] [240]
silvered glass reflectors, [429]
Fraunhofer, early accident,[ 33];
improvement of refractors,[ 34]
clockwork motion, [121]
spectra of flames, [131]
of sun and stars, [133] [134] [372]
objective prism, [385]
diffraction gratings, [439]
Fraunhofer lines, mapped, [133] [136];
origin, [135]-137 [171] [172]
reflected in coronal spectrum, [170] [173] [181]
in cometary spectra, [354] [357]
shifted by radial motion, [201]
Freycinet, distribution of minor planets, [287]
Fritz, auroral periodicity, [162]
Frost, solar heat radiation, [222]