Back to [Numbers 1800-1899]


[Calendar]  This year is a non-leap year, following the adoption of the current Gregorian calendar, created by Pope Gregory XIII in 1582 to reform the old Julian calendar.


[Calendar]  The last year of the 18th century.


[EECS]  1.8K(W) is one of standard numerical values for resistors (of tolerance class 5%).


[Math.]  Sum (in degrees) of all internal angles of a 12-side polygon.


[Money]  A JCB credit card number starts with either 2131 or 1800 (15-digit card) or 3 (for 16-digit card).


[Science]  The mass of a proton is approximately 1800 times more than the mass of an electron.


[Phone]  The first 4 digits to be dialed for any 800/toll-free telephone number dialing within the U.S. and Canada.


[Tech.]  One of standardized baud rate (bits per second) in electronic data transmissions.