The who you are is identification.
The what you are are attributes.
The where you are is geolocation.
The when you are is authentication.
The why you are is philosophy.
Update: In a comment, Toby calls me on equating 'when' with authentication. Admittedly it's more tenuous than the others but the premise was that authentication involves claiming a particular identity 'at a particular time', thus the 'when'.