The *mishna* in Yoma 3:1 talks about watching for dawn to know if it's time for the morning offering, and then [Yoma 3:2](https://www.sefaria.org/Mishnah_Yoma.3.2?lang=bi&with=Yoma&lang2=en) asks:

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> וְלָמָה הֻצְרְכוּ לְכָךְ, שֶׁפַּעַם אַחַת עָלָה מְאוֹר הַלְּבָנָה וְדִמּוּ שֶׁהֵאִיר מִזְרָח, וְשָׁחֲטוּ אֶת הַתָּמִיד,
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> And why was all that necessary? Because once the light of the moon rose and they thought that the east was lit up and slaughtered the continual offering, [and afterwards] they had to take it out to the place of burning.
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How could anybody confuse moonlight for sunlight? I've been out in the countryside far from city lights under a bright full moon, and it's nothing like sunlight. (And the moon in this case wouldn't even be full yet.)

The *g'mara* reports that the school of R' Yishmael taught that it was a cloudy day and light scattered in all directions. I don't buy it; moonlight diffused through heavy clouds looks different from sunlight so diffused.

There's an additional problem: on a full moon, moonrise is the same time as sunset. Moonrise advances about an hour, give or take, per day, so if you count a few days back from the full moon for 10 Tishrei, the moon is rising in the east in mid-afternoon, which is nowhen near the time of the morning offering. By the time it's dark enough to see moonlight, the moon isn't in the eastern sky. Perhaps the *mishna* meant that they saw the *setting* moon, except it says "east" and the moon sets in the west.

What confusing lighting conditions is the *mishna* referring to? According to R' Yishmael, how would a cloudy day contribute to this error?