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| <title>Aphelion distance</title> | ||
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| <h1>Aphelion distance</h1> | ||
| <p><span class="bold">Apsis</span> (Greek: ἁψίς; plural <span class="bold">apsides</span> /ˈæpsɪdiːz/, Greek: ἁψῖδες; "orbit") denotes either of the two extreme points (i.e., the farthest or nearest point) in the orbit of a planetary body about its primary body (or simply, "the primary"). The plural term, "apsides," usually implies both apsis points (i.e., farthest and nearest); apsides can also refer to the distance of the extreme range of an object orbiting a host body. For example, the apsides of Earth's orbit of the Sun are two: the <span class="italic">apsis</span> for Earth's farthest point from the Sun, dubbed the <span class="bold">aphelion</span>; and the <span class="italic">apsia</span> for Earth's nearest point, the <span class="bold">perihelion</span>. (The term "apsis", a cognate with <span class="italic">apse</span>, comes via Latin from Greek).</p> | ||
| <p>The <span class="bold">Aphelion distance</span> is the distance between baricenter and the aphelion.</p> | ||
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| <title>Argument of aphelion</title> | ||
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| <h1>Argument of aphelion</h1> | ||
| <p>The <span class="bold">argument of aphelion</span> is the angle from the body's ascending node to its aphelion, measured in the direction of motion.</p> | ||
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| <title>Eccenctric anomaly</title> | ||
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| <h1>Eccenctric anomaly</h1> | ||
| <p>In orbital mechanics, the <span class="bold">eccentric anomaly</span> is an angular parameter that defines the position of a body that is moving along an elliptic Kepler orbit. The eccentric anomaly is one of three angular parameters ("anomalies") that define a position along an orbit, the other two being the true anomaly and the mean anomaly.</p> | ||
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| <title>Focal parameter</title> | ||
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| <h1>Focal parameter</h1> | ||
| <p>In addition to the eccentricity (<span class="italic">e</span>), foci, and directrix, various geometric features and lengths are associated with a conic section.</p> | ||
| <p>The <span class="bold">focal parameter</span> (<span class="italic">p</span>) is the distance from a focus to the corresponding directrix.</p> | ||
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| <title>Latus rectum</title> | ||
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| <h1>Latus rectum</h1> | ||
| <p>In addition to the eccentricity (<span class="italic">e</span>), foci, and directrix, various geometric features and lengths are associated with a conic section.</p> | ||
| <p>The <span class="bold">latus rectum</span> is the chord parallel to the directrix and passing through a focus; its half-length is the semi-latus rectum (<span class="italic">ℓ</span>).</p> | ||
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| <title>Linear eccentricity</title> | ||
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| <h1>Linear eccentricity</h1> | ||
| <p>In addition to the eccentricity (<span class="italic">e</span>), foci, and directrix, various geometric features and lengths are associated with a conic section.</p> | ||
| <p>The <span class="bold">linear eccentricity</span> (<span class="italic">c</span>) is the distance between the center and a focus</p> | ||
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PlanetoidDB/Resources/terminology_LongitudeDescendingNode.html
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| <title>Longitude of Descending node</title> | ||
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| <h1>Longitude of Descending node</h1> | ||
| <p>The <span class="bold">longitude of the descending node</span> is the angle from a reference direction, called the origin of longitude, to the direction of the descending node, measured in a reference plane.</p> | ||
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| <title>Major axis</title> | ||
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| <h1>Major axis</h1> | ||
| <p>In addition to the eccentricity (<span class="italic">e</span>), foci, and directrix, various geometric features and lengths are associated with a conic section.</p> | ||
| <p>The major axis is the chord between the two vertices: the longest chord of an ellipse, the shortest chord between the branches of a hyperbola.</p> | ||
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| <title>Mean axis</title> | ||
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| <h1>Mean axis</h1> | ||
| <p>The <span class="bold">mean axis</span> is the arithmetic mean of the major axis and the minor axis, and its half-length is the semi-mean axis</p> | ||
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| <title>Minor axis</title> | ||
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| <h1>Minor axis</h1> | ||
| <p>In addition to the eccentricity (<span class="italic">e</span>), foci, and directrix, various geometric features and lengths are associated with a conic section.</p> | ||
| <p>The <span class="bold">minor axis</span> is the shortest chord of an ellipse, and its half-length is the semi-minor axis (<span class="italic">b</span>).</p> | ||
| </body> | ||
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| <title>Orbital area</title> | ||
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| <h1>Orbital area</h1> | ||
| <p>The <span class="bold">orbital area</span> is the area of the orbit.</p> | ||
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| <title>Orbital perimeter</title> | ||
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| <h1>Orbital perimeter</h1> | ||
| <p>The <span class="bold">orbital perimeter</span> is the perimeter of the orbit.</p> | ||
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| <title>Perihelion distance</title> | ||
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| <h1>Perihelion distance</h1> | ||
| <p><span class="bold">Apsis</span> (Greek: ἁψίς; plural <span class="bold">apsides</span> /ˈæpsɪdiːz/, Greek: ἁψῖδες; "orbit") denotes either of the two extreme points (i.e., the farthest or nearest point) in the orbit of a planetary body about its primary body (or simply, "the primary"). The plural term, "apsides," usually implies both apsis points (i.e., farthest and nearest); apsides can also refer to the distance of the extreme range of an object orbiting a host body. For example, the apsides of Earth's orbit of the Sun are two: the <span class="italic">apsis</span> for Earth's farthest point from the Sun, dubbed the <span class="bold">aphelion</span>; and the <span class="italic">apsia</span> for Earth's nearest point, the <span class="bold">perihelion</span>. (The term "apsis", a cognate with <span class="italic">apse</span>, comes via Latin from Greek).</p> | ||
| <p>The <span class="bold">Perihelion distance</span> is the distance between baricenter and the perihelion.</p> | ||
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| <h1>Period</h1> | ||
| <p>The <span class="bold">orbital period</span> is the time a given astronomical object takes to complete one orbit around another object, and applies in astronomy usually to planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars.</p> | ||
| </body> | ||
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| <title>Semi-latus rectum</title> | ||
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| <h1>Semi-latus rectum</h1> | ||
| <p>In addition to the eccentricity (<span class="italic">e</span>), foci, and directrix, various geometric features and lengths are associated with a conic section.</p> | ||
| <p>The latus rectum is the chord parallel to the directrix and passing through a focus; its half-length is the <span class="bold">semi-latus rectum</span> (<span class="italic">ℓ</span>).</p> | ||
| </body> | ||
| </html> |
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| <title>Semi-mean axis</title> | ||
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| <h1>Semi-mean axis</h1> | ||
| <p>The mean axis is the arithmetic mean of the major axis and the minor axis, and its half-length is the <span class="bold">semi-mean axis</span></p> | ||
| </body> | ||
| </html> |
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| <title>Semi-minor axis</title> | ||
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| <h1>Semi-minor axis</h1> | ||
| <p>In addition to the eccentricity (<span class="italic">e</span>), foci, and directrix, various geometric features and lengths are associated with a conic section.</p> | ||
| <p>The minor axis is the shortest chord of an ellipse, and its half-length is the <span class="bold">semi-minor axis</span> (<span class="italic">b</span>).</p> | ||
| </body> | ||
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