André-Louis Danjon (6 April 1890 – 21 April 1967) was a French astronomer born in Caen to Louis Dominique Danjon and Marie Justine Binet.Danjon devised a method to measure "earthshine" on the Moon using a telescope in which a prism split the Moon's image into two identical side-by-side images. By adjusting a diaphragm to dim one of the images until the sunlit portion had the same apparent brightness as the earthlit portion on the unadjusted image, he could quantify the diaphragm adjustment, and thus had a real measurement for the brightness of earthshine. He recorded the measurements using his method (now known as the Danjon scale, on which zero equates to a barely visible Moon) from 1925 until the 1950s.
Among his notable contributions to astronomy was the design of the impersonal (prismatic) astrolabe now known as the Danjon astrolabe, which led to an improvement in the accuracy of fundamental optical astrometry. An account of this instrument, and of the results of some early years of its operation, are given in Danjon's 1958 George Darwin Lecture to the Royal Astronomical Society.He also developed the "Danjon limit", a proposed measure of the minimum angular separation between the Sun and the Moon at which a lunar crescent is visible. However, this limit may not exist.
He was Director of the Observatory of Strasbourg from 1930 to 1945 and of the Paris Observatory from 1945 to 1963.Danjon was the President of the Société astronomique de France (SAF), the French astronomical society, during two periods: 1947–49 and 1962–64.He was awarded the Prix Jules Janssen of the Société astronomique de France in 1950, and the Gold Medal of the Royal Astronomical Society in 1958.
Danjon died in 1967 in Suresnes, Hauts-de-Seine.
Sol turns thousands of years of human wisdom from the world’s spiritual traditions into a totally unique personality profile. To get your own profile, check compatibility with friends and much more, download the Sol App today.
Some of their strengths
Andre Danjon has many admirable traits.
Based on spiritual traditions from around the world, they are someone who can be described as Energetic, Courageous, Passionate, Generous, Intense, Creative, and Bold.
Independent and Brave
According to Mysticism’s Astrology tradition, Andre Danjon is someone who is an independent, brave, and honest person who approaches life with energy, intuition, passion, and generosity. A person who is known for being fun and creative.
Charming and Sophisticated
Based on Daoism’s Ba-Zi or ‘Chinese Zodiac’ tradition, people who know Andre Danjon well know them as someone who can be classy, glamorous, and worldly, like jewelry.
Ambitious and Forceful
According to Hinduism’s Jyotisha or ‘Vedic Astrology’ tradition, many would also describe Andre Danjon as someone who is ambitious, hard-working, determined, and intelligent.
A person who has a knack for identifying opportunities, has amazing concentration and focus, who can work independently, who likes starting new things, and who is somewhat of an intellectual.
Assertive and Protective
Based on the Mayan Tzolk’in or ‘Mayan Astrology’ tradition, Andre Danjon is someone who is a somewhat private person who has a strong personality and ability to read other people.
They are also someone who is patient, assertive, and who is a natural leader that likes to help others in need.
Independent and Dynamic
According to Judaism’s Kabbalah tradition, Andre Danjon tends to be someone who is independent, dynamic, and courageous. Who can be positive, energetic, self-reliant, and adventurous, and who can make friends easily.
Some of Andre Danjon's challenges
While Andre Danjon has many strengths, nobody is perfect. They also have some challenging traits they need to manage.
For example, Andre Danjon can be Self-centered, Short-tempered, Impulsive, Complicated, Brusque, Careless, and Relentless.
Short-tempered and Impulsive
One of Andre Danjon's key challenges is that they are someone who can come across as short-tempered and impulsive.
Relentless and Inflexible
Andre Danjon is someone who can be relentless, obsessive, and inflexible, who can be confrontational with work colleagues, can have difficulty communicating feelings and be somewhat reclusive, and who can be self-destructive, overindulgent, and extravagant.
Aggressive and Domineering
Finally, Andre Danjon also can be aggressive, impatient, impulsive, and short-tempered.
