Outlines of AstronomyBlanchard & Lea, 1856 - 557 стор. |
З цієї книги
Результати 1-5 із 51
Сторінка xi
... altitude , and azimuth instru- ment . Theodolite . Of the sextant and reflecting circle . Principle of repe- tition . Of micrometers . Parallel wire micrometer . Principle of the dupli- cation of images . The heliometer . Double ...
... altitude , and azimuth instru- ment . Theodolite . Of the sextant and reflecting circle . Principle of repe- tition . Of micrometers . Parallel wire micrometer . Principle of the dupli- cation of images . The heliometer . Double ...
Сторінка 35
... altitude above the surface of the earth not exceeding the hundredth part of its diameter , the tenuity , or rarefaction , of the air must be so excessive , that not only animal life could not subsist , or combustion be maintained in it ...
... altitude above the surface of the earth not exceeding the hundredth part of its diameter , the tenuity , or rarefaction , of the air must be so excessive , that not only animal life could not subsist , or combustion be maintained in it ...
Сторінка 38
... altitude ( as it is called ) . Nay , even some of those actually below the horizon , and which would therefore be invisible but for the effect of refraction , are , by that effect , raised above it and brought into sight . Thus , the ...
... altitude ( as it is called ) . Nay , even some of those actually below the horizon , and which would therefore be invisible but for the effect of refraction , are , by that effect , raised above it and brought into sight . Thus , the ...
Сторінка 39
... altitude , H A S , is raised in appearance above its true place , is , unfortunately , a very difficult subject of ... altitudes , or in every situation of a heavenly body , from the horizon to the zenith , ' or point of the sky ...
... altitude , H A S , is raised in appearance above its true place , is , unfortunately , a very difficult subject of ... altitudes , or in every situation of a heavenly body , from the horizon to the zenith , ' or point of the sky ...
Сторінка 40
... altitude . 3dly . The rate of its increase is nearly in proportion to the tangent of the apparent angular distance of the object from the zenith . But this rule , which is not far from the truth , at moderate zenith distances , ceases ...
... altitude . 3dly . The rate of its increase is nearly in proportion to the tangent of the apparent angular distance of the object from the zenith . But this rule , which is not far from the truth , at moderate zenith distances , ceases ...
Інші видання - Показати все
Outlines of Astronomy John Frederick William Herschel,Sir John Frederick William Herschel Повний перегляд - 1851 |
Загальні терміни та фрази
altitude amount angle angular appear apsides ascertained astronomers axis bright calculation celestial centre circle comet curve described diameter difference direction disc distance disturbed body disturbing force diurnal diurnal motion double stars earth ecliptic effect elements ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric horizon inclination increase inequality instance instrument interval Jupiter latitude latter less light longitude lunar magnitude mass mean measure meridian moon moon's motion nearly nebula node normal force nutation object observed orbit parallax parallel perigee perihelion period perpendicular perturbations planet planetary pole portion position precession proper motions proportion recede recess reckoned refraction remarkable render respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day sidereal period situation solar sphere spherical stars station sun's suppose syzygies tangential force telescope tion Uranus variation velocity visible whole zenith