1,550 reputation
1622
bio website msquant.sourceforge.net
location Århus, Denmark
age 50
visits member for 4 years, 10 months
seen yesterday

(Last updated 2014-08-23.)

I am mostly interested in making scientifically important observations, like timing occultations of or by Solar System bodies and measuring variable stars.

I am also interested in citizen science projects and participate in some of them, like Galaxy Zoo.

I have been an amateur astronomer since 1975 and have worked at the European Space agency's (ESA) technical centre in Holland, ESTEC, on the ARISTOTELES mission, an earth gravity mapping mission.

Approximate coordinates: 55°20 N, 10°20 E


Shortcuts:


My other accounts:

Stack Overflow (SO). [/].

Server Fault (SF). [/].

Super User (SU). [/].

Meta Stack Overflow (MSO). [/].

Careers. [/].

Other

My 15 minutes of fame on Super User

Blog. Sample: Jump the shark.

LinkedIn profile

@PeterMortensen (Twitter)

Google profile

Quora profile

GitHub profile

Full jump page with other SOFU related, Stack Exchange sites, etc.


Contact

I can be contacted through this reCAPTCHA (requires JavaScript to be allowed from google.com).


Jan
9
revised What is the actual meaning of the density operator?
Copy edited (e.g. ref. <https://en.wiktionary.org/wiki/let%27s#Contraction>). (its = possessive, it's = "it is" or "it has". See for example <http://www.wikihow.com/Use-its-and-it's>.)
Jan
9
suggested approved edit on What is the actual meaning of the density operator?
Jan
9
revised What is the actual meaning of the density operator?
Copy edited.
Jan
9
suggested approved edit on What is the actual meaning of the density operator?
Dec
27
revised In physics, what is the importance of distinguishing between a matrix and a group?
Copy edited. Added some context.
Dec
27
suggested approved edit on In physics, what is the importance of distinguishing between a matrix and a group?
Dec
8
revised Do the number of possible microstates increase as temperature decreases?
Copye edited (but more work near "change in entropy is more" may or may not be needed).
Dec
8
suggested approved edit on Do the number of possible microstates increase as temperature decreases?
Dec
6
revised If photons don't have charge, why are they deflected by charged black holes?
Copy edited.
Dec
6
suggested approved edit on If photons don't have charge, why are they deflected by charged black holes?
Dec
4
revised How is wind created?
Copy edited (but more work is needed near "I mean"). Removed meta information (this belongs in comments, if any).
Dec
4
revised How is wind created?
Copy edited (this is not Yahoo Answers, <http://knowyourmeme.com/memes/how-is-babby-formed>, but perhaps an even better verb exist? - "come about"?).
Dec
4
suggested approved edit on How is wind created?
Dec
4
suggested approved edit on How is wind created?
Dec
1
revised Does the mass of an electron change with its “energy state”?
Copy edited. (its = possessive, it's = "it is" or "it has". See for example <http://www.wikihow.com/Use-its-and-it's>.)
Dec
1
suggested approved edit on Does the mass of an electron change with its “energy state”?
Nov
28
revised Why does rotation simulate gravity if motion is relative?
Copy edited. (its = possessive, it's = "it is" or "it has". See for example <http://www.wikihow.com/Use-its-and-it's>.)
Nov
28
suggested approved edit on Why does rotation simulate gravity if motion is relative?
Nov
9
awarded  Yearling
Nov
1
revised The sound of rotating helicopter blades
Copy edited.