Given a sentence in English language, translate the sentence to Tagalog language keeping the meaning of the original sentence intact.
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Question: English sentence: During 1546, his final year as an undergraduate, he began to make astronomical observations.

Answer: Sa panahon ng 1546, ang kanyang huling taon bilang isang undergraduate, siya ay nagsimulang gumawa ng astronomya obserbasyon.


Question: English sentence: Skolem published... most of his papers in Norwegian journals, and they have not always been easy to obtain for mathematicians abroad.

Answer: Skolem-publish... karamihan ng kanyang mga papeles sa Norwegian journal, at sila ay hindi palaging ay madaling makuha para sa mga mathematicians sa ibang bansa.


Question: English sentence: It is also to be recommended as a text book on planar graphs.

Answer:
Ito ay din ay inirerekomenda bilang isang teksto ng libro sa planar graph.