# Tag Archives: astro navigation course

## The Demystified Astro Navigation Course Unit 6

UNIT 6 –  Calculating zenith distance and azimuth at assumed position. We can use sight reduction tables to calculate the zenith distance and azimuth at the assumed position or else we can use the traditional method of making the calculations … Continue reading

## The Demystified Astro Navigation Course – Unit 4

Unit 4 – The Importance of Altitude, Azimuth and Zenith Distance in Astro Navigation.  Zenith. The Zenith is an imaginary point on the celestial sphere directly above the observer.  It is the point where a straight line drawn from the … Continue reading

## The Demystified Astro Navigation Course Unit 3 Part 3

Unit 3 Part 3 – Altitude Correction tables for the Moon Note.  Units of this course can be viewed in numerical order under ‘Astro Nav Course’ on the menu bar.  The Moon’s Semi-Diameter.  When the Moon is not full, sometimes … Continue reading

## The Demystified Astro Navigation Course Unit 3 Part 2

Unit 3 Part 2 – Altitude Correction tables for the Sun, Stars and Planets. As shown in the table extract below, corrections for the Sun are divided into two parts to allow for changes in the Sun’s semi-diameter during the … Continue reading

## The Demystified Astro Navigation Course – Unit 3 Part 1

Unit 3  Part 1 – Altitude and Azimuth     The Azimuth is similar to the bearing in that it is the angle between the observer’s meridian and the direction of the celestial body.  However, whereas bearings are measured clockwise from north … Continue reading

## The Demystified Astro Navigation Course Unit 2

Unit 2 – Local Hour Angle and Greenwich Hour Angle  Local Hour Angle (LHA).  In astro navigation, we need to know the position of a celestial body relative to our own position. (The following diagram illustrates the explanations given below). LHA … Continue reading

## The Demystified Astro Navigation Course – Unit 1

Unit 1 Essential Astronomy for Navigators The Celestial Sphere is an imaginary sphere with the Earth located at its centre. We imagine that the ‘celestial bodies’ such as the Sun, Moon, stars and planets are placed on the inner surface … Continue reading