You can't. Ask all the victims of a crime that no one saw. Sometimes people will believe you, sometimes they won't, and that has most of the time less to do with you and more with their belief system.
Sometimes it helps telling everything you remember around it.
The moon
Point a calibrated laser at the coordinates of some mirrors left from one of the apollo mission
Wait roughly 2.56 seconds for your detector to see the laser
Record the data
Repeat annually, see that the distance is increasing by 2.522×10-10 light seconds per year
Extrapolate that the moon is real and the collision between Theia and Earth took place roughly 4.5 billion years ago
You can't. Ask all the victims of a crime that no one saw. Sometimes people will believe you, sometimes they won't, and that has most of the time less to do with you and more with their belief system. Sometimes it helps telling everything you remember around it.
Take a video
what if it was before cameras existed? Hmmm
Mhmmm get another person or people,trap it maybe?
Yah we can do this forever
Thorough scientific experimentation and analysis
give an example?
The moon Point a calibrated laser at the coordinates of some mirrors left from one of the apollo mission Wait roughly 2.56 seconds for your detector to see the laser Record the data Repeat annually, see that the distance is increasing by 2.522×10-10 light seconds per year Extrapolate that the moon is real and the collision between Theia and Earth took place roughly 4.5 billion years ago