Explanation:

- Correct Answer: Option 4: Meteorological

- World Meteorological Day is observed annually on 23 March. In 2019, the theme was "The Sun, the Earth and the weather," highlighting the role of weather, climate, and their linkage to the physical and natural systems of the Earth.

- Option 1: Geographical - This pertains to geography, which is the study of the Earth's landscapes, environments, and the relationships between people and their environments. World Geography-related observances do not typically coincide with this date.

- Option 2: Geological - This refers to geology, which is the study of the Earth’s physical structure and substances. World Geological Day events have different themes and are not celebrated on 23 March.

- Option 3: Astrological - This pertains to astrology, which involves the study of celestial objects and their supposed influence on human affairs. It is not associated with any official world observances.

World Meteorological Day is crucial for spreading awareness about meteorology's impact on environmental stewardship and our understanding of climate dynamics.