During a total solar eclipse, the solar corona can be seen by the naked eye.

During a solar eclipse, the Moon can sometimes perfectly cover the Sun because its size is nearly the same as the Sun's when viewed from the Earth.

During solar proton events, ionization can reach unusually high levels in the D-region over high and polar latitudes.

During the " The Dark Phoenix Saga ", Phoenix becomes overwhelmed and corrupted by her first taste of evil and transforms into a force of total destruction, called " Dark Phoenix ", consuming a star, inadvertently killing the inhabitants of the star's solar system, and jeopardizing the entire universe.

During the daytime the solar wind presses this layer closer to the Earth, thereby limiting how far it can reflect radio waves.

During a solar maximum, the Earth's atmosphere causes drag up to a hundred kilometres higher than during a solar minimum.

During the later periods of Roman history, sun worship gained in importance and ultimately led to what has been called a “ solar monotheism .” Nearly all the gods of the period were possessed of solar qualities.

During the experiment, both spacecraft were going to be on the same idealized magnetic field spiral carried out from the sun by the solar wind.

During solar eclipses, stars close to the Sun were mistaken for planets.

During his term as President of ENEA ( 1999 – 2005 ) he has developed a novel method for concentrating solar power at high temperatures for energy production, known as the Archimede Project, which is presently being developed by industry for commercial use.

During the Amarna period, this synthesis was seen as the invisible source of energy of the sun god, of which the visible manifestation was the Aten, the solar disk.

During the formation of the Solar System, there were probably many more " terrestrial " planetesimals, but they have all merged with, been destroyed by, or been ejected by the four remaining worlds in the solar nebula.

During the new moon and solar eclipse of February 4 — 5, 1962, an extremely rare great conjunction of the classical planets occurred ( it included all five of the naked-eye planets plus the Sun and the Moon ), all of them within 16 degrees of one another on the ecliptic.

During the launch ceremony, a space war fleet from an alien race of humanoid giants arrives into the solar system and identifies the Macross as a former battleship used by their enemies, the Supervision Army.

During a major space weather event which includes a burst of solar energetic particles, the flux can increase by one to several orders of magnitude.

During the termination phase of the mission, a " windmill experiment " was performed: Atmospheric molecular pressure exerts a torque via the then windmill-sail-like oriented solar cell wings, the necessary counter-torque to keep the sonde from spinning is measured.

During this time it gradually fell into disrepair, with most of the buildings dismantled to build nearby farmhouses in the 1660s, but leaving the solar tower intact.

During forthcoming solar storms, this could result in blackouts and disruptions in artificial satellites.

During the main phase of a geomagnetic storm, electric current in the magnetosphere create magnetic force which pushes out the boundary between the magnetosphere and the solar wind.

During solar events and geomagnetic storms, the system gave navigators information that is inaccurate by as much as several miles.

During that encounter the solar panels could not be used since the craft was in the planet's shadow, where it would not receive any solar light for 15 minutes, causing a dangerous shortage of power.

During the Atari 7800 ’ s life cycle, Atari found themselves struggling to get developers to create 7800 versions of then-popular arcade titles because of a controversial policy employed by Nintendo.

During his years in London, A. E. Housman completed A Shropshire Lad, a cycle of 63 poems.

During pregnancy, the cervix is blocked by a special antibacterial mucosal plug, which prevents infection, somewhat similar to its state during the infertile portion of the menstrual cycle.

During interphase ( the period of the cell cycle where the cell is not dividing ), two types of chromatin can be distinguished:

During this stage of the cell cycle this makes the individual chromosomes in many cells visible by optical microscope.

During the cell division cycle, a new centriole grows from the side of each of the existing " mother " centrioles.

During the menstrual cycle or estrous cycle, the endometrium grows to a thick, blood vessel-rich, glandular tissue layer.

During breakfast at dawn, Granger ( leader of the group of wandering intellectuals ) discusses the legendary phoenix and its endless cycle of long life, death in flames, and rebirth, adding that the phoenix must have some relation to mankind, which constantly repeats its mistakes, but that man has something the phoenix doesn't.

During the Utsarpini half cycle, humanity develops from its worst to its best: ethics, progress, happiness, strength, health, and religion each start the cycle at their worst, before eventually completing the cycle at their best and starting the process again.

During genome replication the circularization acts to enhance genome replication speeds, cycling viral RNA dependent RNA polymerase much the same as the ribosome is hypothesized to cycle.

During the remainder of that decade the steps of the main cycle of nuclear fusion in stars were worked out by Hans Bethe.

During 2010-2012 the cycle highway is receiving upgrades to further encourage the use of bicycles for transport between Nijmegen and Arnhem.

During the interphase of the cell cycle the formation of the prepore would happen within the nucleus, each component being transported in through existing NPCs.

During Series 3 he suffered the first of several serious mental breakdowns, which also marked the onset of a decades-long cycle of manic / depressive illness.

During this time most of Wagner ’ s creative energy was devoted to the Ring cycle, which was finally completed in 1874 and given its first full performance at Bayreuth in August 1876.

During the lag phase of the bacterial growth cycle, synthesis of RNA, enzymes and other molecules occurs.

During system development, CM allows program management to track requirements throughout the life cycle through acceptance and operations and maintenance.

During each cycle of the AC voltage, extra energy, in addition to any energy consumed in the load, is temporarily stored in the load in electric or magnetic fields, and then returned to the power grid a fraction of a second later in the cycle.

During the cycle, the red second hand continues its normal 1 rpm motion but is held in place when it reaches the 60 second mark.

During the spring, it may be set back in the ground to complete its life cycle.