Watch.

[finwitch]

No: HPFGUIDX 111692

Just my theory:

1 hand for seconds
1 hand for minutes
1 hand for hours
(ordinary watch, 3 hands)
1 hand for Day
1 hand for Month
1 hand for Year
(another 3 to tell the date)

That's six to tell his present time.

He'll have another six for timetravel...

Planets: they tell the phases of 'planets', (moon phase is important, 
and not necessarily for potion ingredients - that's Snape's job - but 
to know whether Lupin is about to transform... dunno what other 
planets mean, but I believe Dumbledore does :-)

Oh, and he _can_ turn himself invisible. We don't need methamorphmagi 
for that - after all, Hogwarts Library has an Invisibility Section 
(and that means there's LOTS of books about invisibility, one devoted 
to Cloaks and their making, one to invisible beings, one for 
invisible ink, one for invisibility charms, setting invisibility 
(like the invisibility booster in the Ford Anglia?)...)

Finwitch