We observe the sky as it looks<span>, not as it </span>is<span>. You feel like you are on top of the Earth (the result of gravity drawing you toward the Earth's center). In the example, you are at a </span>latitude<span> (your location along an arc from the Earth's equator to the rotation pole, given by lower case </span>Greek letter<span> Phi) of 45°, halfway between the Earth's equator and the north pole. The latitude of the north pole is 90°, that of the equator 0°. The Earth appears to lie at the center of a fictional </span>celestial sphere<span>. You pretend that you are inside the sphere at the center looking out around you. Above your head is your </span>zenith<span>, while directly below you is your </span>nadir<span> (both of which are points on the celestial sphere). In between is the great circle of the </span>horizon<span>, which is the circle on the celestial sphere cut by a plane tangent to the Earth at your feet. Everything in the sky above the horizon is visible, while everything below it is not. </span>
<span>The celestial sphere is tipped relative to the observer in the same way as is the Earth. The extension of the Earth's rotation axis to the sky defines the </span>North and South Celestial Poles<span> (the NCP and SCP), while the extension of the Earth's equatorial plane defines the </span>celestial equator<span>. The NCP is in the constellation </span>Ursa Minor<span> (the Smaller Bear) close to the direction of the star </span>Polaris<span>, otherwise called the </span>North Star<span>. The SCP is in the modern constellation </span>Octans<span>, the Octant, in the general direction of the faint southern pole star </span>Sigma Octantis<span> (Polaris Australis). </span>
<span>The circle that runs through the zenith, nadir, NCP, and SCP is the </span>celestial meridian<span>. The intersection of the celestial meridian and the horizon define </span>north<span> (N) and </span>south<span> (S), while that between the equator and the horizon define </span>east<span> (E) and </span>west<span> (W). The intersection of the celestial meridian and the celestial equator (upper case </span>Greek letter<span> Sigma) is down from the zenith by an angle equal to the latitude.</span>
<span>The Earth rotates about its poles from west to east (counterclockwise as viewed from above the north pole), which makes the sky </span>seem to rotate<span> in the other direction about the north and south celestial poles parallel to the celestial equator. The elevation above the horizon (the </span>altitude<span>) of the NCP always equals the observer's latitude. If you are in the southern hemisphere, the south celestial pole (the SCP) is above the horizon, the NCP below it. A star on the celestial sphere seems to go around the observer on a </span>daily path<span> (red circle). The perpendicular angle of a star north or south of the celestial equator is given by its </span>declination<span>, indicated by lower case </span>Greek letter<span>Delta. When the star drops below the horizon, it </span>sets<span>, while when it comes up above the horizon it </span>rises<span>. A star on the celestial equator rises exactly east, sets exactly west. The greater the declination, the farther north of west the star both sets and rises. If far enough north (declination 90° - latitude), the star misses the horizon and is </span>circumpolar<span>, that is, always visible. If the declination is far enough south, the star does not get above the horizon and is always invisible. </span>
THE ECLIPTIC<span>Though in truth the Earth orbits the </span>Sun<span>, we feel stationary, which makes the Sun </span>appear<span> to go around the Earth once a year in the counterclockwise direction (from west to east, counter to its daily motion across the sky) along a steady path called the </span>ecliptic. Since there are 365 (actually 365.2422...) days in the year and 360° in the circle, the Sun moves to the east at the slow pace of only a bit under a degree per day. At the same time it is constantly moving (rather, appearing to move) from east to west as a result of the Earth's rotation, just at a pace slightly slower than the stars because of its simultaneous easterly drift. The perpendiculars to the ecliptic plane define the ecliptic poles<span>. The </span>North Ecliptic Pole<span> (NEP) is in </span>Draco<span>, the </span>South Ecliptic Pole<span> (SEP) in </span>Dorado.
<span>The Earth's axis is tilted relative to the perpendiculars to the ecliptic plane by an angle of 23.5° (actually closer to 23.4°). The tilt separates the celestial and ecliptic poles by the same angle, which causes the circle of the ecliptic to be tilted relative to the celestial equator again by the same angle, which as a result is called the </span>obliquity of the ecliptic<span>. As it moves along the ecliptic against the background stars, which are there even if you cannot see them against the </span>blue sky<span>, the Sun, therefore, appears also to move north and south of the celestial equator. </span>
A nurse administers two serial intramuscular injections of betamethasone to a woman at 32 weeks' gestation who has been admitted in preterm labor. the nurse knows that this medication is given to stimulate fetal surfactant production. The presence of this surfactant factor in the pulmonary alveoli is essential for adaptation to extrauterine life. The surfactant is a substance that significantly reduces the surface tension within the pulmonary alveolus, preventing collapse during expiration.
In the deep waters of the ocean, coral reefs are found in abundance. Algae live on these coral reefs, providing nutrition and producing pigments that give color to the corals. The corals offer shelter to the algae. So, they share a symbiotic association. Climate change has led to increased temperatures and has caused the corals to throw away the algae living inside them. This action causes the corals to be bleached because of a lack of pigment. This change will lead to coral bleaching. The corals will die of lack of nutrition with time.
The organelle is labeled is nucleus, which means, where the chromosomes and one or more nucleoli are located immersed in the nucleoplasm or also karyolymph.
<h3>What is a nucleus organelle?</h3>
The nucleus, generally the largest eukaryotic cell organelle is the region delimited by membrane, where the chromosomes and one or more nucleoli immersed in the nucleoplasm or also karyolymph are located.
The nucleus of an organelle is composed of the karyotheca, chromatin, nucleoplasm and nucleolus.