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Rational Horizons and Positioning in Celestial Navigation

This free online course explains rational horizons and the steps for calculating position lines in celestial navigation.

Publisher: ADU
When learning about celestial navigation, it is essential to learn about the types of horizons: visible, sensible and rational. Learning about position-fixing and calculating position lines is of utmost importance. You will become able to explain the relationship between time and longitude and measure local mean time (LMT). Start this course today to improve your understanding of the horizon types and their positioning.
Rational Horizons and Positioning in Celestial Navigation
  • Duration

    3-4 Hours
  • Students

  • Accreditation


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‘Rational Horizons and Positioning in Celestial Navigation’ is a course specifically developed to teach you about visible, sensible and rational horizons. We will improve your understanding of sextant altitude, sensible horizon and the horizon system of coordinates. We expose you to very important concepts in celestial navigation. You will learn about the angle that you can obtain after correcting the index error and the concept of the parallax. Do you know there is a relationship between time and longitude and between time and the hour angle? We explore how you can measure the local mean time (LMT) westerly from the inferior meridian of the observer. Prepare yourself to study the position-fixing of a ship when the ship is out of sight of land and the time of meridian altitude of the sun with the meridian passage calculation. You will discover a method called the ‘Ex-meridian of the sun’, which we will investigate.

Completing this course will help you calculate and deduce calculated longitudes and intercepts. We examine the intercept methods of sight calculation and how to deduce the true azimuth and use it to obtain the compass error. In navigation, it is important to learn about simultaneous and staggered observations. We help you derive the direction of the position lines by observing the sun and calculating the direction of the position lines by following the planet. To learn about these position line calculations, you need to find the approximate GMT mer pass. It is necessary to learn how to obtain the declination for the time of mer pass. We demonstrate how to calculate the obs lat and state direction of LOP.

This course will help you become familiar with the longitude by chronometer and intercept methods of sight calculation. Master the intercept or Marc St Hilaire method and procedure for solving longitude by using the chronometer problem. We explain the process that you can use to find the latitude of the observer when the heavenly body is near the observer’s meridian. This course will help you become acquainted with the fundamentals of navigation. Do you know that you can illustrate the visible sunrise and sunset? We will cover the calculation of compass error by amplitude measurement in this course. We analyse the relationship between the GHA of the sun and GMT. This free online course will be of great interest to students, researchers and anyone interested in celestial navigation. Register for this course and start learning today!

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