The second two pieces lap over the inner member of the keelson and butt against the outer member.

We have already seen that odd numbers were considered as being Yang, while the even numbers were Yin, so that the eight outer numbers of the Lo Shu represented these two principles in balanced equilibrium around the axial center.

In some categories — notably groups, rings, and Lie algebras — it is possible to separate automorphisms into two types, called " inner " and " outer " automorphisms.

Each adrenal gland has two distinct structures, the outer adrenal cortex and the inner medulla, both of which produce hormones.

The two outer capsid proteins, VP2 and VP5, mediate attachment and penetration of BTV into the target cell.

The vehicle would have three axles and the outer two could pivot to adapt to curvature of the track.

In green plants, chloroplasts are surrounded by two lipid-bilayer membranes that are thought to correspond to the outer and inner membranes of the ancestral cyanobacterium.

The outer cells become the trophectoderm or trophoblast, which will form in combination with maternal uterine endometrial tissue the placenta, needed for fetal nurturing via maternal blood, while inner cells become the inner cell mass that will form all fetal organs ( the bridge between these two parts eventually forms the umbilical cord ).

The inner orbital route runs approximately around the heart of the Georgian city and the outer orbital route runs primarily along the natural circle formed by Dublin's two canals, the Grand Canal and the Royal Canal, as well as the North and South Circular Roads.

A minor difference between the two Dragon models is the outer case colour ; the Dragon 32 is beige and the 64 is light grey.

The two first fields must be square in form and the two outer fields must be 6 / 4 lengths of those.

The outer membrane is also continuous with the inner nuclear membrane since the two layers are fused together at numerous tiny holes called nuclear pores that perforate the nuclear envelope.

In 1516, after a failed Navarrese-French attempt to expel the Spanish invaders from the kingdom, an attempt in which Francis ' brothers had taken part, the Spanish Castilian kingdom's Governor, Cardinal Cisneros, ordered family lands to be confiscated, the demolition of the outer wall, the gates and two towers of the family castle, the moat was filled, and the height of the keep was reduced in half.

For two years he worked quietly at Gray's Inn, until he was admitted as an outer barrister in 1582.

A triple harp features three rows of parallel strings, two outer rows of diatonic strings, and a center row of chromatic strings.

Like the double-strung harp, the two outer rows of strings are tuned the same, but the triple-strung harp has no levers.

The traditional design has all of the strings strung from the left side of the neck, but modern neck designs have the two outer rows of strings strung from opposite sides of the neck to greatly reduce the tendency for the neck to roll over to the left.

A prime example of this are the two crafts of the Voyager program, which used slingshot effects to change trajectories several times in the outer Solar System.

A fully mature coat is formed naturally from the soft undercoat and the coarser outer coat combining to form tassels, or cords and will take around two years to form.

These had four turrets mounting two 30. 5 cm guns arranged in two turrets either end, with the inner turret able to fire over the outer.

The castle, now much ruined, comprised two walled baileys set one behind the other, with the outer bailey on the town side and the inner bailey on the cliff side.

Each labium majus has two surfaces, an outer, pigmented and covered with strong, crisp hairs ; and an inner, smooth and beset with large sebaceous follicles.

The labia minora ( singular: labium minus ), also known as the inner labia, inner lips, or nymphae, are two flaps of skin on either side of the human vaginal opening, situated between the labia majora ( outer labia, or outer lips ).

After it was shown that at least one such body was larger than Pluto, on August 24, 2006 the International Astronomical Union ( IAU ) reclassified Pluto, grouping it with two similarly sized " dwarf planets " rather than with the eight " classical planets ".

On 21 April 1992, radio astronomers Aleksander Wolszczan and Dale Frail announced the discovery of two planets orbiting the pulsar PSR 1257 + 12.

COROT ( launched December 2006 ) and Kepler ( launched March 2009 ) are the two currently active space missions dedicated to searching for extrasolar planets.

For instance, in the 55 Cancri system the first planet – 55 Cancri b – was discovered in 1996 ; two additional farther planets were simultaneously discovered in 2002 with the nearest to the star being named 55 Cancri c and the other 55 Cancri d ; a fourth planet was claimed ( its existence was later disputed ) in 2004 and named 55 Cancri e despite lying closer to the star than 55 Cancri b ; and the most recently discovered planet, in 2007, was named 55 Cancri f despite lying between 55 Cancri c and 55 Cancri d. As of April 2012 the highest letter in use is " j ", for the unconfirmed planet HD 10180 j ( HD 10180 h is the confirmed planet with the highest letter ).

They note that the discoverers of the two planets around HW Virginis tried to circumvent the naming problem by calling them " HW Vir 3 " and " HW Vir 4 ", i. e. the latter is the 4th object – stellar or planetary – discovered in the system.

They also note that the discoverers of the two planets around NN Serpentis were confronted with multiple suggestions from various official sources and finally chose to use the designations " NN Ser c " and " NN Ser d ."

They note that under these two proposed rules all of the present names for 99 % of the planets around single stars are preserved as informal forms of the IAU sanctioned provisional standard.

To deal with the difficulties relating to circumbinary planets, the proposal contains two further rules:

They say that it requires the complete renaming of only two exoplanetary systems: The planets around HW Virginis would be renamed HW Vir ( AB ) b & ( AB ) c, while those around NN Serpentis would be renamed NN Ser ( AB ) b & ( AB ) c. In addition the previously known single circumbinary planets around PSR B1620-26 and DP Leonis ) can almost retain their names ( PSR B1620-26 b and DP Leonis b ) as unofficial informal forms of the "( AB ) b " designation where the "( AB )" is left out.

The two planets have other subtle but important differences.

Edmond Halley in 1692 put forth the idea of Earth consisting of a hollow shell about thick, two inner concentric shells and an innermost core, about the diameters of the planets Venus, Mars, and Mercury.

* The planet from which the spaceship starts is moving round the Sun at a different speed than the planet to which the spaceship is traveling, because the two planets are at different distances from the Sun ( due to Kepler's third law ).

The Hohmann transfer applies to any two orbits, not just those with planets involved.

At least two fundamental non-terrestrial energy sources have been proposed: solar-powered energy generation ( unhampered by clouds ), either directly by solar cells or indirectly by focusing solar radiation on boilers which produce steam to drive generators ; and electrodynamic tethers which generate electricity from the powerful magnetic fields of some planets ( Jupiter has a very powerful magnetic field ).

The classical ( low-eccentricity ) belt is home to at least three dwarf planets: there are two known larger objects currently outside the Kuiper belt which probably originated in the Kuiper belt.

It was also the first spacecraft to encounter two planets at close range, and for 33 years the only spacecraft to photograph Mercury in closeup.

The first two, unlike scattered disc objects, have perihelia outside the gravitational reach of Neptune, and thus their orbits cannot be explained by perturbations from the gas giant planets.

Hansen's opinion was that a single body could not adequately explain the motion of Uranus, and theorised that two planets lay beyond Uranus.

Astronomer Georges Forbes concluded on the basis of this evidence that two planets must exist beyond Neptune.

In 1900 and 1901, Harvard Observatory director William Henry Pickering led two searches for trans-Neptunian planets.

The first was begun by Danish astronomer Hans Emil Lau who, after studying the data on the orbit of Uranus from 1690 to 1895, concluded that one trans-Neptunian planet alone could not account for the discrepancies in its orbit, and postulated the position of two planets he believed were responsible.

In 1909, Thomas Jefferson Jackson See, an astronomer with a reputation as an egocentric contrarian, opined " that there is certainly one, most likely two and possibly three planets beyond Neptune ".

In 1911, Indian astronomer Venkatesh P. Ketakar suggested the existence of two trans-Neptunian planets, which he named Brahma and Vishnu, by reworking the patterns observed by Pierre-Simon Laplace in the planetary satellites of Jupiter and applying them to the outer planets.