Calculators
Calculators
Embedded Files
SPREADSHEETS
Hosted on this server:
INTERACTIVE SPREADSHEETS FOR CELESTIAL NAVIGATION
© Navigation Spreadsheets - All rights reserved.
Excellent work for celestial navigation, with spreadsheets and explanations. The use of these spreadsheets finds a middle ground between manually doing all the steps needed to plot your line of position on a chart and simply pushing a button to read your location on a GPS receiver.
This program for sextant astronomical sight reduction is based on a Microsoft Office Excel workbook, using macro-commands. It was developed to help solving sextant sight data quickly and without using correction tables other than the daily pages of the Nautical Almanac.
Requires Microsoft Office Excel 2013
COMPLETE CELESTIAL SIGHT REDUCTION SPREADSHEET
Covers all navigational bodies.
This Excel spreadsheet can be used to check your manual sight reduction worked out using the Sun Almanac and Sight Reduction Tables downloaded from BackBearing.
Enter the information required into the unlocked white cells bounded in green. The grey cells return intermediate results, such as GHA, Declination, LHA, Hc and Ho, which you can compare with results obtained from the Sight Reduction Tables. The final result, in blue, is your Azimuth and Intercept. The password is "backbearing".
NAUTICAL CALCULATORS
Hosted on this server:
NAUTICAL CALCULATORS OF THE MARITIME SAFETY OFFICE
Celestial Navigation Calculators:
Altitude Correction for Air Temperature
Compass Error from Amplitudes Observed on the Celestial Horizon
Compass Error from Amplitudes Observed on the Visible Horizon
Latitude and Longitude Factors
Meridian Angle and Altitude of a Body on the Prime Vertical Circle
Altitude Correction for Atmospheric Pressure
Sight Reduction Tables for Marine Navigation (Pub. No. 229)
Conversions Calculators:
Conversion for Meters, Feet and Fathoms
Natural and Numerical Chart Scales
Distance Calculators:
Distance of an Object by Two Bearings
Length of a Degree of Latitude and Longitude
Dip of the Sea Short of the Horizon
Distance by Vertical Angle Measured Between Sea Horizon and Top of Object Beyond Sea Horizon
Distance by Vertical Angle Measured Between Waterline at Object and Top of Object
Distance by Vertical Angle Measured Between Waterline at Object and Sea Horizon Beyond Object
Log and Trig Calculators:
Logarithmic and Trigonometric Functions Calculator
Sailings Calculators:
Time Zones Calculators:
Weather Data Calculators:
Correction of Barometer Reading for Gravity
Correction of Barometer Reading for Height Above Sea Level
Correction of Barometer Reading for Temperature
Relative Humidity and Dew Point
Barometer Measurement Conversions
Direction and Speed of True Wind
NAUTICAL CALCULATORS BY J.J. JACQ
Navigation Utilities
Aries & Sun Nautical Almanach (1900 - 2100)
Sun-Run-Sun. Position Lines Intercept
Apparent Wind To Real Wind Calculator
Real Wind To Apparent Wind Calculator
Closest Point of Approach Calculator
OTHER CALCULATORS
No hosted on this server:
Calculating Position from two observed Altitudes
This application determines the location of the navigator from two measured celestial altitudes as obtained from two sextant sights. A displacement between the two sights is taken into account through the evaluation of the estimated positions (EP) of both sights.
The calculated position is the position at the time of the second sight.
Altitude and Azimuth of a Celestial Body for an Assumed Position
This application calculates the Altitude (Hc) and Azimuth (Az) of a Celestial Body as observed in a specific Location.
Altitude and Azimuth of the Sun for given Time and Location
This application gives the horizon coordinates (Altitude (Hc) and Azimuth (Az)) of the Sun for a given time and location. It will also calculate the apparent Altitude (Hs) as will be observed through a sextant measurement.
Altitude and Azimuth of the Moon for given Time and Location
This application gives the horizon coordinates (Altitude (Hc) and Azimuth (Az)) of the Moon for a given time and location. It will also calculate the apparent Altitude (Hs) as will be observed through a sextant measurement.
Rise- and Set-Times of the Sun and the Moon at a given Date and Position
This application will calculate the rise- and set time for both the Sun and the Moon for a given date and location. Also the bearing for these events is calculated. This is the direction in which the Sun or Moon can be observed while rising or setting on the local horizon.
Sight Reduction for the Sun
This celestial navigation software written in JavaScript performs all calculations necessary to derive a line of position from an observation of the Sun.
Sight Reduction for the Moon
This celestial navigation software written in JavaScript performs all calculations necessary to derive a line of position from an observation of the Moon.
Sight Reduction Calculator
A compact sight reduction program. Includes altitude corrections. Requires GHA and declination from the Nautical Almanac or ICE (See below).
Fix Calculator
This program for celestial navigation calculates the point where two lines of position intersect (intercept method) and replaces a graphic plot.
Long-term almanac for Moon, Stars, and lunar distances
This program calculates Greenwich hour angle (GHA), siderial hour angle (SHA), and declination (Dec) for the moon and 58 bright stars including Polaris.
Long Term Almanac for Sun, Moon, Brighter Planets and Polaris
A perpetual almanac for Sun, Moon, Venus, Mars, Jupiter, Saturn, and Polaris. Calculates GHA, RA, Dec, and miscellaneous astronomical data. Requires the current value for ΔT. This is an extended version of the above program.
RA to GHA Converter
This calculator has been developed primarily to extract the Greenwich Hour Angle, GHA, of a celestial body from MICA (Multiyear Interactive Computer Almanac) in a convenient way, but it can be used in combination with other almanac software or printed almanacs as well.
Interactive Computer Ephemeris (ICE)
by U.S. Naval Observatory
This ancient (1980s) DOS program calculates Greenwich hour angle and declination for Sun, Moon, planets, and the navigational stars with a precision equal to that given in the Nautical Almanac. ICE covers a time span of almost 250 years. Rising, setting, and twilight times are also provided. It further performs sight reduction (including altitude corrections) for any assumed position.
In spite of its age and archaic user interface, ICE is a useful reference software for people writing their own computer almanacs.
Addendum: You need a DOS emulator to run ICE nowadays.
DOSBox, an DOS-emulator program, is available for WindowsOS, MacOS and LinuxOS platforms.
Google Sites
Report abuse