ASTRON: Integrated Astro Navigation Software Home Page V2.219. 2021 Sept 3
Date and Time Input Watch Corr Daylight
Year Month Day Hour Minute Second Secs (Slow +ve) Saving
Body Data GHA of GHA of Dec of
Body: Aries
Observation
Windows
Apparent Body Position Bearing (°T) Altitude (°)
Assumed Assumed Unidentified body?
Latitude Longitude
Deg Deg Calculated Calculated
M.m M.m LHA of LHA of
Aries Azimuth (Zn) Altitude (Hc)
 
 
Sextant Altitude Corrections Observer Alt
Sextant Index SD HP
Altitude (Hs) Correction (IC)
Deg (Off Arc +ve) Eye Height (HoE) Limb Parallax Corr Observed
M.m M.m Altitude (Ho)
 
Azimuth and Intercept Calc Hs
Shore Dist (nm): Rise Mer. Passage Set

ASTRON SIGHT LOG AND PLOTTER

COG SOG
Day Hour Minute Second (Degs T) (Knots)


<< < > >>

 

 SIGHT PLANNER & SKY CHART

Year - +
Month - +
Day - +
Hour - +
Minute - +
Second
 
Set Present Time
 
Lat
Long
 
Sun Altitude
Moon Altitude
Moon Phase
 
 
 

ASTRON ALMANAC PAGE

Lat
Long
 
 
 
 
Set Present Time
 
Year - +
Month - +
Day - +
Hour - +
Minute -- ++
- +
Second -- ++
- +
 
Aries
SHA
GHA
LHA
 

ASTRON SETTINGS PAGE


TYPE OF HORIZON Default SEA. See User Notes Sections 15 & 16 for other types.
TOO LIGHT SUN Hc Suggested value -3.0° (Mid Civil Twilight). Range 0.0° to -6.0°.
TOO DARK SUN Hc Suggested value -9.0° (Mid Nautical Twilight). Range -6.0° to -20.0°.
TYPE OF
START UP
LAST USED: Start with date/time set to last used values.
PRESENT: (Default). Start with date/time set to present time.
SHOW EXTRA DECIMALS Recommended Value 0. Shows EXTRA decimal places. Range 0 to 3.
Formatting (including plotter and planner) may become ragged when > 0.
SHOW LUNAR
ARC DISTANCE
Show on legend bar below Astron and Google Sight Plotters
YES: Show sextant arc (LDs) between selected body and Moon at cursor position.
NO: (Default). Don't show it.
MSL TEMPERATURE
AND PRESSURE
YES: (Default). Always enter MSL Temperature and Pressure.
NO: If Observer Alt > 0, enter AMBIENT Temperature and Pressure.
DELTA-T AUTO: (Default.) Astron uses calculated value for ΔT.
MANUAL: User can enter a specific value. Use 0 for Terrestrial Time. (TT/TD).
TIME SYNC OFFSET When selected, Time Sync shows device system time offset by this amount.
Default and recommended value: 0 seconds.
Range -200s (Retarded) to +200s (Advanced).
RESET ALL Reset settings and inputs to default values. Custom Star resets to "Castor"
INCLUDE CUSTOM STAR Default value: NO.
YES: All utilities include the CUSTOM STAR detailed in the pop-up table below.
NO: (Default). CUSTOM STAR is hidden.
 
Custom Star Data (Equinox J2000.0 Epoch J2000.0)
Star Name RA (D.d) Dec (+/-D.d) pm RA (mas/yr) pm Dec (mas/yr) Magnitude
NOTES on using this CUSTOM STAR utility. See User Notes / Settings / "Include Custom Star" for more detail.
• Astron holds data for a single CUSTOM STAR.
• On changing this option to "YES", the CUSTOM STAR becomes visible and becomes the currently selected body. Other bodies can be selected as normal.
• On all other pages, the CUSTOM STAR name is preceeded by a "★" distinguishing mark.
• The CUSTOM STAR is shown as the last body in the body select list and elsewhere. [Keystroke hint: Press "z" then "⯆"]
• When option set to "YES", the CUSTOM STAR is included in all Astron utilities.
• When option set to "NO", the star is excluded and this table hidden.
• When Astron is closed, CUSTOM STAR data is remembered for next use.
• On first use, the CUSTOM STAR is set to Castor (α Geminorum).
• When entering values, RA and Dec must be in degrees and decimal degrees.
• pm RA values are in milliarcseconds of ARC, not mas of Right Ascension.
• Input data must be referenced to J2000.0 Equinox and Epoch. Astron then adjusts to the selected date and time.
• See User Notes / Settings / "Include Custom Star" for suggested link to catalogue star data.

ASTRON STAR INFORMATION PAGE


ASTRON LUNARS PAGE

 
Altitude (Hs) Moon Moon Moon
Deg Limb SD/Aug Corr Apparent Cleared
M.m Alt (Ha) Alt (Hcl)
Use calc Hs
All
 
Limb SD Corr Apparent Cleared
Altitude (Hs) Alt (Ha) Alt (Hcl)
Use calc Hs
 
Sextant Arc (LDs) Moon ==== User Entered Values ====
Deg Limb Limb Ass Lat Ass Long
M.m
==== Lunar Revised Values ====
Calc Lat
Calc Long

ASTRON MERIDIAN PASSAGE PAGE

 
 
Corrections for observer movement and
rate of change of body declination
COG
(degs T)
SOG
(knots)
Dec Rate
(mins/hour)
Observer
Northings
Time
Correction
Latitude Longitude