Question: Who was the physician of Tycho Brahe a Danish nobleman known for his accurate and comprehensive astronomical and planetary observations?

Context paragraphs:
Great Comet of 1577: The Great Comet of 1577 (official designation: C/1577 V1) was a comet that passed close to Earth during the year 1577 AD.  It was viewed by people all over Europe, including the famous Danish astronomer Tycho Brahe and Turkish astronomer Taqi ad-Din.  From his observations of the comet, Brahe was able to discover that comets and similar objects travel above the Earth's atmosphere.  The best fit using JPL Horizons suggests that the comet is currently about 320 AU from the Sun (based on 24 of Brahe's observations spanning 74 days from 13 November 1577 to 26 January 1578).

MF Tycho Brahe: M/F "Tycho Brahe" is a Danish train and car ferry that operates between Helsingør, Denmark and Helsingborg, Sweden, a distance of just 5 km.  M/F "Tycho Brahe" has been in use since 1991.  The ship is bidirectional, therefore it can change direction without turning around, so no time is lost for this.  The ship is also able to accelerate and decelerate quite quickly to and from her maximum speed of 14 knots.

Knutstorp Castle: Knutstorp Castle (Swedish: "Knutstorps slott" , Danish: "Knudstrup" ) is a castle in Svalöv Municipality, Scania, in southern Sweden.  It was built in the 16th century by Otte Brahe, when Scania was still Danish.  It is the birthplace of the famous astronomer Tycho Brahe (born 14 December 1546) and his astronomer sister Sophia Brahe (born 24 August 1556).

Tycho Brahe: Tycho Brahe ( , born Tyge Ottesen Brahe (] ); 14 December 154624 October 1601) was a Danish nobleman known for his accurate and comprehensive astronomical and planetary observations.  He was born in the then Danish peninsula of Scania.  Well known in his lifetime as an astronomer, astrologer and alchemist, he has been described as "the first competent mind in modern astronomy to feel ardently the passion for exact empirical facts."  His observations were some five times more accurate than the best available observations at the time.

Sophia Brahe: Sophia or Sophie Brahe or after marriage Sophie Thott Lange (22 September 1556 or 24 August 1559 – 1643), was a Danish horticulturalist with knowledge of astronomy, chemistry, and medicine.  She assisted her brother Tycho Brahe with his astronomical observations.

Tycho Brahe Planetarium: The Tycho Brahe Planetarium is located in Copenhagen, Denmark, at the southern end of Skt.  Jørgens Sø.  It is named after astronomer Tycho Brahe.  It was designed by MAA Knud Munk and opened on November 1, 1989.

Tycho Brahe days: In the folklore of Scandinavia, Tycho Brahe days (Danish: "Tycho Brahes-dage"; Norwegian: "Tycho Brahedager"; Swedish: "Tycho Brahe-dagar") are days judged to be especially unlucky, especially for magical work, and important business transactions and personal events.  Tycho Brahe (1546–1601) was a Danish astronomer, astrologer, and alchemist and as such achieved some acclaim in popular folklore as a sage and magician.

Tycho Brahe (Martian crater): Tycho Brahe is a crater on Mars named after the Danish astronomer Tycho Brahe (1546–1601).  It is located in the Cerberus hemisphere around 49.8° south and 213.9° west, in an area which is south of the Martz crater and east of the Hellas Basin.  It measures approximately 105 kilometers in diameter.  The name was adopted by IAU's Working Group for Planetary System Nomenclature in 1973.

John Craig (physician): John Craig M.D. (died 1620) was a Scottish physician, known also as an astronomer.  He was physician to James VI of Scotland, and accompanied him to England.  He also corresponded with Tycho Brahe, and associated with John Napier.

Manderup Parsberg: Manderup Parsberg (December 24, 1546 - November 11, 1625) was a Danish nobleman and politician who was member of the Royal Privy Council to King Christian IV of Denmark.  As a student at the University of Rostock he participated in a duel against his third cousin Tycho Brahe in which he cut off most of his nose.  The two later became good friends, and he married Tycho's distant cousin Anne Pedersdatter Brahe (1578-1633).  Parsberg was lord to Hagesholm.  When, in a funeral oration for Brahe, an allusion was made to their unfortunate duel, Parsberg protested and sought redress through King Christian, stating that they had been good friends from that time onward, and that the injury Brahe suffered had been accidental, in the course of a fair fight.  On this basis he wished the reference to be removed from the oration.

Supporting paragraphs: John Craig (physician) Tycho Brahe
Answer: John Craig M.D.