Astronomy 1 (Solar System)

astronomy is part of the knowledge or the ability to run the ship in the vast ocean.

Part of seamanship that use dr viewing objects space.
Objectives: - Define guidelines Errors / Deviation
- Determine the position of the vessel
Currently widely used electronic navigation aids utuk
replace the science of Astronomy Shipping.
Science Pel. Astronomy still in need because:
1. If the electronic navigation system is damaged, it is necessary to move
to astronomical navigation
2. The right not to sail without vision just based
on one system. solar system

SOLAR SYSTEM

The sun is the center of our solar system is surrounded by planets 
planets are: 

• merkurius
• venus                                                 in planet
• earth(bumi)

• mars
• jupiter
• saturnus 
• uranus                                              out planet    
• neptunus 
• pluto

Of the nine planets around the sun only four planets that can used for navigation purposes of determining position astronomical namely:

Venus Jupiter

Mars Saturn

This is because

- The distance is relatively close to Earth than any other planet

- Size is large enough

- Power is strong enough pantulnya

All the planets around the sun, including the Earth elleps shaped trajectory.

The value of the eccentricity of the eleps

± 0.017

The events of the earth around the sun is called Revolution

In circulation arour to the plane of the ecliptic, but forming an angle of 66 degrees .30minute to the plane ecliptic.

As a result,

Equator does not coincide with the field ekleptika but makes an angle 23 degres.30minute against ekleptika field.

There are three celestial coordinate system

1.celestial horizon coordinates

2.celestial equatorial coordinates

2celestial ecliptic coordinates

definitions

- True horizon: Sliced space / plane that passes through the center space, upright straight on nornal overseers.

- Local Horizon: Fields that through the eyes of overseers, in line with the true horizon

- Edges true sky: Sliced space with cone field which is described by a line tangent to the earth from the eyes of overseers.

- The subjection of the true edge of the sky (pts): The angle between the direction of the edge of the real sky and

local horizon.

- Edges virtual sky: Limits section of the earth's surface which is still seen by the inspector

- The subjection edge virtual sky (PTM): The angle between the direction of the edge of the virtual sky and local horizon.

- High-Eye: Eye height above sea level overseers.

- High measuring (tu): The angle between the direction of the edge of the virtual sky and celestial bodies that look (which reads high on aircraft sextant)

- True High (ts): upright circular arc distinguished by a celestial body, betweentrue horizon and the center point of the celestial bodies.

Parallax = difference in direction, in which the same object seen from two different points reply.

Flat parallax (Po) = angle which describe the radius of the earth in where overseers if seen from the object space which is above the horizon

Parallax in height (Par) = angle which describe the radius of the earth in place when seen from the object inspector space which is above the local horizon.

RAYS ARCH ASTROMOMI (Lsa)= Angle between the direction of where we see the celestial body and the actual direction he was.