The first of a month is the new moon day. On fifteenth of the same month, which of the following figures would represent the phase of the moon?

Options

A.
B.
C.
D.

Answer

To solve the question about the phase of the moon on the 15th of the month when the 1st is a new moon day, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Moon Phases**: The moon goes through different phases in a cycle of approximately 29.5 days. The main phases are:
- New Moon
- First Quarter
- Full Moon
- Last Quarter

2. **Identify the New Moon Day**: The question states that the 1st of the month is a new moon day. This means that on this day, the moon is positioned between the Earth and the Sun, and it is not visible from Earth.

3. **Calculate the Days to the 15th**: From the new moon on the 1st, we count 15 days to reach the 15th of the month.

4. **Determine the Moon Phase on the 15th**: After 15 days from the new moon, the moon will have completed half of its lunar cycle. This means it will be in the full moon phase, where the entire face of the moon is illuminated and visible from Earth.

5. **Select the Correct Figure**: The question asks which figure represents the moon phase on the 15th. Since we established that the moon will be full on the 15th, we need to look for an option that shows a fully illuminated moon.

6. **Conclusion**: The correct answer is the option that depicts a full moon, which is option A.

### Final Answer:
The phase of the moon on the 15th of the month will be represented by option A, which shows a full moon.

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