The first sign that something was wrong if the moon disappeared overnight would likely be the sudden change in the tides. The gravitational pull of the moon plays a significant role in creating ocean tides, so without it, we would see a dramatic decrease in tidal fluctuations. This could manifest as unexpectedly low tides in coastal areas, which might confuse and concern people who notice the unusual water levels. Additionally, many would likely feel a sense of something amiss in the night sky, as the moon is such a prominent and familiar presence.
The first sign that something was wrong if the moon disappeared overnight would likely be the sudden change in the tides. The gravitational pull of the moon plays a significant role in creating ocean tides, so without it, we would see a dramatic decrease in tidal fluctuations. This could manifest as unexpectedly low tides in coastal areas, which might confuse and concern people who notice the unusual water levels. Additionally, many would likely feel a sense of something amiss in the night sky, as the moon is such a prominent and familiar presence.