Musar for Rosh Hashanah 1:5

בֵּין שֶׁנִּרְאָה בַעֲלִיל בֵּין שֶׁלֹּא נִרְאָה בַעֲלִיל, מְחַלְּלִין עָלָיו אֶת הַשַּׁבָּת, רַבִּי יוֹסֵי אוֹמֵר, אִם נִרְאָה בַעֲלִיל, אֵין מְחַלְּלִין עָלָיו אֶת הַשַּׁבָּת:

Whether it (the moon) were seen distinctly, [high above the earth, visible to all] or not seen distinctly, [(if it were) on the horizon and obscured by the redness of the sun, so as not to be plainly visible], the Sabbath is desecrated for it. R. Yossi says: If it were seen distinctly, the Sabbath is not desecrated for it, [for (in that instance) it was certainly seen in Jerusalem. The halachah is not in accordance with R. Yossi.]

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