The all sky aurora was some time between 1981 and early 1989.
I can't think how to be more accurate as it was pre digital.
I submit reports monthly but don't keep them for years.
My colleagues have immaculate reports and statistics from about 1960, but usually don't submit them anywhere.
So they have the beautiful log books but the observations don't go into a database.
In the U.K. data exists for over 130 years in one organisation.
200 plus years in another.
In the U.S. 70 years for planets and probably longer for variable stars.
Herschel's, Newton's and Galileo's observations exist at least partly.
Babylonian, Chinese, Mayan and Greek observations go back a thousand to 4,000 years.
Possibly Egyptian also.
The Vatican also has very old records.
As to optics, Dallmeyer records are in a local library.
Taylor Hobson records exist.
Probably Zeiss also.
As to museums, well I loaned items that disappeared.
It is not only the British museum where items go walkies.
There is a huge trade in looted antiquities.
Regards,
B.
