Question: Through Distant Worlds and Times was written by an astronomer whose first fundamental contribution to global science was what?

Context articles: Spiru Haret
Alma Howard
Extremes (novel)
First fundamental form
Amy Barger
Through Distant Worlds and Times
Global Science Academy of Toronto
Milutin Milanković
Global Science Opera
Taxonomic database

Spiru C. Haret (] ; 15 February 1851 – 17 December 1912) was a Romanian-Armenian mathematician, astronomer and politician.
 He made a fundamental contribution to the "n"-body problem in celestial mechanics by proving that using a third degree approximation for the disturbing forces implies instability of the major axes of the orbits, and by introducing the concept of "secular perturbations" in relation to this.
Alma Clavering Howard Rolleston Ebert (23 October 1913 – 1 April 1984) was a Canadian-born English radiobiologist.
 She was Joint Editor for many years of the International Journal of Radiation Biology and Deputy Director of the Paterson Laboratories in Manchester.
 She made a "fundamental contribution to cell biology" in collaboration with physicist Stephen Pelc when they "were the first to ascribe a timeframe to cellular life," creating the concept of the cell cycle.
 Their nomenclature for the stages of cell replication is used universally and appears in every textbook of biology and pathology.
Extremes is the second book in the Retrieval Artist series by Kristine Kathryn Rusch.
 The novels are situated at an unstated time in the future where humans have colonized many distant worlds.
 In addition, treaties with alien races allow for the extradition of humans to other worlds to stand trial.
 Since most of these extraspecies crimes carry a sentence of death, an industry has sprung up to hide these people.
 Those who vanish are called the "Disappeared".
 Not everyone who disappears does so to hide from aliens' justice, some are hiding from human justice, others just want to escape from their past.
 Two professions have sprung up to find those people: Trackers and Retrieval Artists.
 Trackers, similar to bounty hunters, seek the disappeared and return them to justice, or to those willing to pay for them to be found again.
 Retrieval Artists also seek the disappeared, but instead of dragging them back to justice, are more often hired by lawyers seeking to have inheritances delivered (minus the sum it cost to find them).
 Frequently, retrieval artist are followed by trackers in order to find the individual being sought.
In differential geometry, the first fundamental form is the inner product on the tangent space of a surface in three-dimensional Euclidean space which is induced canonically from the dot product of R.
 It permits the calculation of curvature and metric properties of a surface such as length and area in a manner consistent with the ambient space.
 The first fundamental form is denoted by the Roman numeral I,
Dr. Amy J. Barger (born January 18, 1971) is an American astronomer whose discoveries have most concerned quasars, black holes, and other far distant objects.
 She helped show that the activity of black holes in nearby galaxies was greater and more recent than expected.
 She also worked with others on discoveries concerning stellar activity in distant galaxies.
 She currently is a professor at the University of Wisconsin–Madison.
Through Distant Worlds and Times or Through Distant Worlds and Times: Letters from a Wayfarer in the Universe is a romantic scientific story written by Milutin Milanković, the Serbian mathematician, astronomer, geophysicist and climatologist, in the form of letters to an anonymous young woman.
Global Science Academy of Toronto (also known as Global Academy and GSAT) is a private, independent school in Toronto, Ontario.
 Global Science Academy primarily serves students of several communities in the Greater Toronto Area (GTA), particularly residents of High Park, Bloor West Village and Swansea areas.
 The Academy also admits foreign students who are willing to obtain Canadian credit courses.
 In addition to high school credit courses based on Ontario Ministry of Education curricula, Global Science Academy offers tutoring services and summer school.
 Moreover, weekly meetings of Global Math Club for Secondary (grades 8-12) and Post Secondary students is a great place for those with passion on mathematics and want to prepare for math contests and competitions.
Milutin Milanković (, pronounced ] ; 28 May 1879 – 12 December 1958) was a Serbian mathematician, astronomer, climatologist, geophysicist, civil engineer and popularizer of science.
 Milanković gave two fundamental contributions to global science.
 The first contribution is the "Canon of the Earth’s Insolation", which characterizes the climates of all the planets of the Solar system.
 The second contribution is the explanation of Earth's long-term climate changes caused by changes in the position of the Earth in comparison to the Sun, now known as Milankovitch cycles.
 This explained the ice ages occurring in the geological past of the Earth, as well as the climate changes on the Earth which can be expected in the future.
 He founded planetary climatology by calculating temperatures of the upper layers of the Earth's atmosphere as well as the temperature conditions on planets of the inner Solar system, Mercury, Venus, Mars, and the Moon, as well as the depth of the atmosphere of the outer planets.
 He demonstrated the interrelatedness of celestial mechanics and the Earth sciences, and enabled consistent transition from celestial mechanics to the Earth sciences and transformation of descriptive sciences into exact ones.
The Global Science Opera (GSO) is a creative education initiative that combines science, art, technology, and education in a global network of scientists, art and education institutions and projects.
 Using digital interaction, schools, universities and art and institutions from over 30 participating countries perform and live-stream Global Science Opera performances.
 One team in each participating country is invited to develop a two-minute scene for the opera, with all the scenes being performed together on a designated date as a continuous, real-time event that viewers can watch online.
A taxonomic database is a database created to hold information related to biological taxa - for example groups of organisms organized by species name or other taxonomic identifier - for efficient data management and information retrieval as required.
 Today, taxonomic databases are routinely used for the automated construction of biological checklists such as floras and faunas, both for print publication and online; to underpin the operation of web based species information systems; as a part of biological collection management (for example in museums and herbaria); as well as providing, in some cases, the taxon management component of broader science or biology information systems.
 They are also a fundamental contribution to the discipline of biodiversity informatics.