
1) American young adult novel 2) Astronomy book 3) Break of day 4) Historical novel
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https://www.crosswordclues.com/clue/first-light
[Preston book] First Light: The Search for the Edge of the Universe is a 1987 non-fiction book on astronomy and astronomers by Richard Preston. The title refers to the astronomical term first light, which is when a telescope is first used to take an astronomical image after it has been constructed. First light also refers to the moment when...
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http://en.wikipedia.org/wiki/First_Light_(Preston_book)
[Sunil Ganguly] First Light (প্রথম আলো) is an award-winning novel by Sunil Gangopadhyay. It encompasses the second half of nineteenth century of Indian history, specially then ongoing Bengal Renaissance. The story of the novel centers around many historical figures including Rabindranath Tagore, Swami Vivekananda, Ramakrishn...
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http://en.wikipedia.org/wiki/First_Light_(Sunil_Ganguly)
[Wellum book] First Light: The Story of the Boy Who Became a Man in the War-Torn Skies Above Britain is a 2002 memoir by Geoffrey Wellum, a British fighter pilot in World War II. ==Synopsis== The book opens with Wellum`s interview for the Royal Air Force and his training. It then shifts to his participation in the Battle of Britain and to h...
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http://en.wikipedia.org/wiki/First_Light_(Wellum_book)
[radio] First Light is a syndicated talk radio program hosted by Dirk Van. The one-hour live program airs weekdays at 5:00 a.m. Eastern Time and is one of a small number of programs airing live (and taking listener phone calls) in that time slot. A weekend version, The Week in Review, also is available, in conjunction with Jim Bohannon`s Am...
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http://en.wikipedia.org/wiki/First_Light_(radio)
[astronomy] In astronomy, first light is the first use of a telescope (or, in general, a new instrument) to take an astronomical image after it has been constructed. This is often not the first viewing using the telescope; optical tests will probably have been performed during daylight to adjust the components. The first light image is norm...
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http://en.wikipedia.org/wiki/First_light_(astronomy)

The inaugural celestial observation of a major new telescope – an emotional moment for those involved in the project, and a critical one, since it is the first test of the optical system on a 'live' object.
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http://www.daviddarling.info/encyclopedia/F/first_light.html
No exact match found.