Reference for Rosh Hashanah 49:8

א"ר יוחנן מ"ט דבי רבי דכתיב (תהלים קד, יט) עשה ירח למועדים שמש ידע מבואו שמש הוא דידע מבואו ירח לא ידע מבואו

R'Johanan said: What is the reason of the house of Rabbi?<span class="x" onmousemove="('comment',' Rabbi was a descendent of Rabban Gamaliel.');">¹⁵</span> Because it is written, Who appointest the moon for seasons, the sun knoweth his going down.<span class="x" onmousemove="('comment',' Ps. CIV, 19.');">¹⁶</span> It is the sun which knows its going down, but the moon does not know its going down.<span class="x" onmousemove="('comment',' I.e., its speed varies.');">¹⁷</span>

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