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Ephemeris data for: "Planet activeness: a new concept to enhance the accuracy of Astromet weather forecast"

Cite this dataset

Ganesan, Dheebakaran (2024). Ephemeris data for: "Planet activeness: a new concept to enhance the accuracy of Astromet weather forecast" [Dataset]. Dryad.


Background: Astrometeorology is an ancient science, that addresses the relationship between planet position and weather events. Several Indian studies proved that astrometeorology could be a complementary method to improve numerical weather forecast accuracy. Since 2011, Tamil Nadu Agricultural University is involved in astrometeorological research and devised a novel concept "Planet Activeness Chart". The principle is that “planets’ influence on a location’s weather varies throughout the day and may be negative, inactive, active, highly active and rule depending on their angle to that location”. Most existing astrometeorological studies used planetary position to predict the occurrence of weather events (yes/no) but failed to capture the intensity of such events. The “Planet Activeness Concept” could address this limitation and enhance forecast usability.

Methods: A study was carried out from 2018 to 2021 with six years of data (2011-16) to verify the “planet activeness” on hourly rainfall and wind speed events in Tamil Nadu. The frequency of planet activeness for a weather event was calculated by dividing the number of times a planet was in the selected activeness during a specific event category by the total number of events.

Results: The results indicated that the negative state of the Sun, and the active status of Saturn, Uranus, Venus, and Moon were positively associated with rainfall intensity. The windy planets Mercury and Neptune being in active states, the Sun and Saturn in rule states, Venus and Uranus in negative states, and Jupiter at a highly active state all had a significant influence on the increased wind speed.

Conclusion: Applying the planet activeness concept with azimuth could enhance the accuracy and usability of Astrometeorological forecasts. This study establishes a mathematical relationship between planet activeness and weather as a first step to understanding the science behind this relationship. It is suggested to study different combinations of planets' activeness during a weather event for more insights.

README: Ephemeris data for: "Planet activeness: a new concept to enhance the accuracy of Astromet weather forecast"

Description of the data and file structure

Azimuth is the angle formed between a reference direction (north) and a line from the observer to a point of interest projected on the same plane as the reference direction, orthogonal to the zenith. The ephemeris is continuous time series values of planets’ azimuth and hourly scale was used in this study.

The Azimuth and ephemeris of nine planets viz., Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, and Neptune during the weather event happening hours at each selected location of 31 districts in Tamil Nadu were calculated for the period of six years from 1.1.2011 to 31.12.2016 and stored here as “xls” format.

Alcyone Ephemeris 4.3v calculator, which is simple and fast astronomical position calculation software was used in this study. Each location's hourly data is placed in a separate folder and all folders are compressed as a single zip file.

Each file is named with "district name"*"location name""period""year"**. (Example: Ariyalur_*AndimadamJD11.xls)
Period JJ = January to June. JD=June to December
Year 11=2011, 12=2012, 13=2013, 14=2014, 15=2015, 16=2016

Metadata of the ephemeris file can be seen in the first 9 rows of each file, which include the following (example for one location):
Alcyone Ephemeris
Ephemeris type: observer table (apparent positions)
Coordinate center: observer's location (topocentric data) - AWS-Andimadam (India) (11° 17' 30'' N, 79° 24' 00'' W)
Plane of reference: observer's local horizon (horizon coordinates)
Coordinates corrected for refraction (T=20 °C, p=1010 hPa)
Azimuth measurement: from south
Time scale: UT-5h 17m 36s
Step size: 1:00:00

The column of the file contains Date and time (UTC 5.30), Julian Day(JD), azimuth, and altitude of nine planets in order (Sun, Mercury, Venus, Moon, Mars, Jupiter, Saturn, Uranus, Neptune)

We have used ephemeris data alone for this article.


Dataset developed by running ephemeris calculator.