During the eighteenth century, the figure of the priest, mathematician and botanist José Celestino Mutis ( 1732 – 1808 ), was delegated by the Viceroy Antonio Caballero y Gongora to conduct an inventory of the nature of the Nueva Granada, which became known as the Botanical Expedition, which classified plants, wildlife and founded the first astronomical observatory in the city of Santa Fé de Bogotá.

During East Han dynasty, astronomical observatory ( 灵台 ) built in Yanshi, Henan Province, China

During a sidereal day, an astronomical object will cross the meridian twice: once at its upper culmination, when it is at its highest point as seen from the earth, and once at its lower culmination, its lowest point.

During her leisure hours she occupied herself with observing the sky with a focal length Newtonian telescope and by this means detected a number of astronomical objects during the years 1783 – 87, including most notably an independent discovery of M110 ( NGC 205 ), the second companion of the Andromeda Galaxy.

During his astronomical observations, Timocharis recorded that the star Spica was located 8 ° west of the Autumnal equinox.

During his monkhood, Mongkut studied both indigenous astrology and English texts on Western astronomy and mathematics, hence developing his skills in astronomical measurement.

During her career, she helped develop a common designation system for stars and catalogued thousands of stars and other astronomical phenomena.

During his tenure, he took over the administration of the great astronomical observatories at Greenwich, England, and the Cape of Good Hope, Africa.

During the 20th century, spectroscopy ( the study of these spectral lines ) advanced, particularly as a result of the advent of quantum physics that was necessary to understand the astronomical and experimental observations.

During the 1980s, astronomers saw that the nascent technologies which formed the basis of the Internet could eventually be used to build an electronic indexing system of astronomical research papers which would allow astronomers to keep abreast of a much greater range of research.

During the mid 1660s with his work on the theory of colour, Newton came to the conclusion that this defect was caused by the lens of the refracting telescope behaving the same as prisms he was experimenting with, breaking white light into a rainbow of colors around bright astronomical objects.

During this record-setting 16-day mission, the crew conducted observations around the clock to study the far ultraviolet spectra of faint astronomical objects and the polarization of ultraviolet light coming from hot stars and distant galaxies.

During the 1920s with his wife Isha, Schwaller de Lubicz established in Switzerland the Station Scientifique Suhalia, a research centre consisting of " laboratories for physics, chemistry, micro-photography and the manufacture of homeopathic tinctures was set up, along with an astronomical observatory, a machine shop, workshops for woodworking, blacksmithing, printing, weaving, rugmaking and glassmaking and a theater.

During 1922 he published a review of astronomical theories and techniques ( La Revue Du Ciel ).

During the astronomical polar night stars of the sixth magnitude, which are the dimmest stars visible to the naked eye, will be visible throughout the entire day.

During the early 19th century, the Round Tower became outdated as an astronomical observatory.

During the 1970s Moulton was home to an astronomical observatory that was relocated to Sussex in the early 1980s.

During the Northern Sung dynasty in China, a historical astronomical record was written, which lists unusual phenomena observed in the night sky.

During the course of his life he produced about 7, 000 quality astronomical illustrations.

During this time his main astronomical work centered on stellar astronomy.

During the 1930s other ideas were proposed as non-standard cosmologies to explain Hubble's observations, including the Milne model, the oscillatory Universe ( originally suggested by Friedmann, but advocated by Albert Einstein and Richard Tolman ) and Fritz Zwicky's tired light hypothesis.

During his childhood, Langmuir's parents encouraged him to carefully observe nature and to keep a detailed record of his various observations.

During his years in Kendal, Dalton contributed solutions of problems and questions on various subjects to the Gentlemen's and Ladies ' Diaries, and in 1787 he began to keep a meteorological diary in which, during the succeeding 57 years, he entered more than 200, 000 observations.

During observations, the barking of Australian dingoes revealed itself to have a relatively small variability, and the subgroups of barking characteristic of domestic dogs could not be found.

During observations, growling made up 65 % of the observed vocalisations.

During observations in Germany, dingoes were heard to produce a sound that the observers called Schrappen.

During this period he also wrote the book Avant et après ( before and after ), a fragmented collection of observations about life in Polynesia, memories from his life and comments on literature and paintings.

During experimental observations by a U. S. Geological Survey volunteer ( from 1985 to 1989 ), the highest temperature was an amazing 100 ° F ( 38 ° C ) and the lowest was 31 ° F (- 0. 5 ° C ).

During the 20th century, observations showed that H II regions often contained hot, bright stars.

During his stay in India up to 411 CE, he went on a pilgrimage to Mathura, Kanauj, Kapilavastu, Kushinagar, Vaishali, Pataliputra, Kashi and Rajgriha and made careful observations about the empire's conditions.

During the 1980s, there were many attempts to relate the fields that generate the vacuum energy to specific fields that were predicted by attempts at a Grand unification theory and to use observations of the Universe to confirm one or another version.

During the peak years, Cope published around 25 reports and preliminary observations each year.

During their travels, they conducted numerous observations and provided documentation later used for works in geomorphology, climatology, and ethnography.

During their stay at Fort Clatsop, the Corps of Discovery made many observations about the landscape and local life, as well as establishing relations with the local Clatsop Indians.

During its 29-month mission, which was extended, it made observations in ultraviolet wavelengths to measure the history of star formation in the universe 80 percent of the way back to the Big Bang.

During their observations, they note that nobody is at the temple worshiping the Master.

During the earthquake of Lisbon, 1755, which was distinctly felt at Cadiz, he took observations and did much to allay the apprehensions of the public, for which he was ennobled by the king of Spain.

During their eight day mission, crew members deployed the Earth Radiation Budget Satellite, conducted scientific observations of the earth with the OSTA-3 pallet and Large Format Camera, and demonstrated potential satellite refueling with an EVA and associated hydrazine transfer.

During the 8-day flight, the crew deployed the Earth Radiation Budget Satellite, conducted scientific observations of the earth with the OSTA-3 pallet and Large Format Camera, and demonstrated potential satellite refueling with an EVA and associated hydrazine transfer.

During Skylab 4, he was co-leader of the visual observations project and coordinator between the flight crew and the principal investigators for the solar science experiments.

During the first shuttle glow observations in the new orbit, Mission Specialist Pierre Thuot reported the glowing effect was much more pronounced at the lower altitude.

During a gamma-ray source observation, one detector would take observations of the source, while the other would slew slightly off source to measure the background levels.