Reference for Shabbat 258:8

אמר שמואל אכל חטה והקיז דם לא הקיז אלא לאותה חטה והנ"מ לרפואה אבל לאוקולי מיקיל

Why not on Tuesday? Because the planet Mars rules at even-numbered hours of the day.<span class="x" onmousemove="('comment',' Jast. Ma'adim lit., means the reddener. The hours as well as the months were thought to stand under the influence of planets which moulded their nature. The planet Mars represented war and pestilence and retribution, whilst the even-numbered hours of the day were regarded as particularly susceptible to disaster. This double combination was therefore very dangerous, and bloodletting might have serious results. ');">⁷</span>

Jastrow

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