Eye witness accounts are useful way to get evidence in a legal case or to report something like someone claiming to see something out of the ordinary, such as Bigfoot.
BUT an eyewitness is not the best way to get evidence in a case. First, the eyewitness could lie or exaggerate the truth. This wouldn't happen often in a court case, but it can happen. Second, studies have shown that eyewitnesses often make mistakes, even when they sincerely believe the account they've given or believe a certain suspect is the right one.
In an investigation people don't stop at an eyewitness account. Investigators then use the information that the eyewitness gave to search for more clues to what might have happened.
To see an event.
yea
A primary account
A
A primary source is an eyewitness account to an event.
An eyewitness account from a prisoner at the bastille.
A
primary
Primary source
Well, when people saw the umbrella like cloud above the volcano, felt the ground rumbling and possibly shaking they kind of got the idea that Vesuvius was erupting. When they began to be pelted with pumice and other volcanic spew, they knew that Vesuvius was erupting.
Benvolio is the eyewitness to Romeo killing Tybalt in William Shakespeare's play "Romeo and Juliet." He recounts the events to Prince Escalus, providing a firsthand account of the altercation that led to Tybalt's death.
Most biblical scholars believe that the Gospel of Matthew was not written by an eyewitness of Jesus' ministry, but by a second-generation Christian who compiled various sources, including the oral traditions of the early Christian community. It is thought to have been written between 80-90 AD.