Definition:
The time when the sun is up in the sky is called "morning." It is the period of the day between sunrise and noon.

Explanation:
- Morning is the time of day when the sun rises and starts to illuminate the sky. It is the beginning of a new day and is characterized by the gradual increase of light as the sun climbs higher in the sky.
- Morning is typically associated with a sense of freshness and rejuvenation. It is the time when people wake up from their sleep and begin their daily activities.
- During the morning, the temperature gradually rises as the sun's rays become more direct. This is why the morning is often considered a pleasant time of day, especially during the cooler seasons.
- The duration of the morning varies depending on the time of year and the geographic location. In general, mornings are longer during the summer months and shorter during the winter months.
- Morning is also a time when many people engage in specific activities. For example, it is common to have breakfast in the morning to fuel the body for the day ahead. Additionally, morning is a popular time for exercise, as it helps to kickstart the metabolism and energize the body.
- Morning is often associated with a sense of productivity and freshness. It is considered an ideal time for studying or working on tasks that require focus and concentration.
- As the morning progresses, the sun continues to rise and eventually reaches its highest point in the sky, marking the transition into the afternoon.

Key Points:
- Morning is the time when the sun is up in the sky.
- It is characterized by the gradual increase of light and temperature.
- Morning is associated with a sense of freshness and productivity.
- It is a time for activities such as breakfast, exercise, and work/study.
- The duration of the morning varies depending on the time of year and location.
- Morning transitions into the afternoon as the sun reaches its highest point in the sky.