The channel known as NHK in Japan is not to be confused with "TV Japan",
which although is O&O by the NHK Corporation, is a completely different
service. I don't believe the NHK branded service is available outside of
Japan? I haven't checked.
NHK [Nippon Hoso Kyokai] is the national broadcaster in Japan.
Equivalent is the BBC,CBC,ABC etc.
As far as I can gather and have seen for myself,TVJapan [via OPTIK TV] normally carries mostly NHK branded programming and others such as TBS,Tokyo Broadcasting System and other private broadcasters.
Therefore not to be confused with NHK.
At the moment it is mostly NHK with the LIVE news and some programming such as the current High School Baseball tournament [NHK].
One of the serials TEPPAN [NHK] is broadcast daily before the news lately.
Even then they sometimes show live information left and above the program being broadcast
Most scheduled broadcasting is off.Also the TVJapan website seems to be unavailable during this crisis per my Google search as to what the reason of unavailability was.
I have a clock set to Japan time and it is in sync with NHK time displayed on screen.
There is the NHK International web site.