Question

start each observation with factual information such as...
the phase of the moon, your favorite time of the day, and your dogs name.
the date, time, and place of the observation.
the date you met your best friend, the time you ate lunch that day, and weather at the time of the observation.
the year, time, and the joke that your little sister told at the time of the observation.

Explanation:

When making observations in a scientific - or general factual - context, the most relevant and standard starting factual information is the date, time, and place of the observation. This provides a clear and objective reference for the observation. The other options include personal or less - relevant details for a standard observation.

Answer:

the date, time, and place of the observation.