To predict the moon phase on December 15 based on the information provided, we need to analyze the graph's data points regarding the percentage of the moon visible.
Assuming the graph completes one full lunar cycle (approximately 29.5 days), we can estimate the moon phase on December 15.
- Beginning of December: If we consider the cycle to start at a full moon, by around December 1 the moon would likely be full.
- Waning Phase: Progressing through December, the moon would gradually become less visible (waning) as it approaches the new moon phase.
- Specific Date Prediction: By December 15, which is about halfway through a typical lunar cycle, it's reasonable to conclude that the moon would be in the waning crescent phase (as it would be increasing visibility until reaching back to a new moon).
Therefore, I predict that the moon phase on December 15 will be waning crescent.