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Ilmi Sitorashinosi dar nimai duyumi asri XIX — avvali asri XX

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Asbobhoi navi tadqiqoti ba peshravii ilmi sitorashinosi kumak rasondand. Bo yorii tahlili spektrali, ki on hanuz soli 1859 kashf karda shuda bud. sitorashinosi anglis J. Loker dar oftob khati spektrero yoft, ki ba unsurhoi khimiyavii on vaqt dar zamin malum monand bud. U in unsurro geliy (nomi lotinii Oftob) nomid. Olimi digari anglis U. Ramzay soli 1895 in gazro dar sharoiti laboratori paydo namud.

Tahlili spektraliro olimon baroi omukhtani sitoraho ham isgifoda meburdagi shudand. Olimi anglis U. Heggins ba omuzishi spektralii tumannokii berun az Galaktika ibtido guzosht.

Dar Kongressi sitorashinoson, ki on soli 1887 dar sh. Parij barguzor gardid, qaror doda shud, ki fehrasti (katalog) sitoraho tartib doda shavad. Dar in kor 18 rasadkhonai jahon ishtirok kard. Dar natijai in kor qarib 2 million sitoraho dar in fehrast ba qayd girifta shudand.

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