To accurately predict the moon phase on December 15 based on a graph, we would need to see the trends and cycles indicated in that graph. Since I can't see the graph, I can provide general information about moon phases to help you make an informed choice.
The moon goes through a complete cycle approximately every 29.5 days. Here are the primary phases in order:
- New Moon
- Waxing Crescent
- First Quarter
- Waxing Gibbous
- Full Moon
- Waning Gibbous
- Last Quarter (or Third Quarter)
- Waning Crescent
If you know the moon phase on a specific date close to December 15, you can count forward or backward to estimate the phase on December 15.
If you can provide the phase on a nearby date, I could help you better predict the moon phase for December 15.