Different seasons are formed because :

Appeared in: RRB Staff Nurse Delhi-2015

Explanation

The Earth's revolution is its year-long orbit around the Sun.
Seasons are not caused by the Earth's distance from the Sun but by the tilt of its axis (approximately 23.5 degrees).
As the Earth revolves, this constant tilt means different hemispheres receive more direct solar energy at different times of the year.
When the Northern Hemisphere is tilted toward the Sun, it experiences summer, while the Southern Hemisphere has winter, and vice versa.

Option A: This describes the geocentric model of the solar system, which has been proven incorrect. The Earth revolves around the Sun, not the other way around.
Option C: The Earth's rotation on its axis causes the cycle of day and night. It is a 24-hour cycle, whereas seasons change over the course of a year.
Option D: This option is incorrect because a valid reason is provided in the options. Option B is a key component of why seasons occur.

Visual 1: Diagram - An illustration showing the Earth revolving around the Sun with its axis tilted. The diagram should highlight the four key positions corresponding to the summer solstice, winter solstice, spring equinox, and autumn equinox, showing how direct sunlight hits different hemispheres at each point.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain The astronomical cause of Earth's seasons as background academic context rather than a clinical decision trigger.
This is a general knowledge question testing fundamental scientific literacy, not a clinical nursing concept.
Understanding seasonality can be relevant in public health for tracking seasonal diseases (like influenza) and in mental health for understanding conditions like Seasonal Affective Disorder (SAD), as mentioned in the search results (SRC_1, SRC_2).
What if the Earth's axis was not tilted? If the axis were perpendicular to its orbital plane, there would be no seasons. The climate at any given location would be the same year-round.

How to Approach the Question

First, identify the core scientific concept being asked: the cause of seasons.
Evaluate each option based on fundamental astronomical principles.
Differentiate between the Earth's two primary movements: rotation and revolution.
Recall that rotation (spinning on the axis) causes day and night (a 24-hour cycle).
Recall that revolution (orbiting the Sun) combined with the axial tilt causes seasons (a one-year cycle).
Eliminate the options that are factually incorrect (Sun orbiting Earth) or explain a different phenomenon (rotation causing day/night).

Concept Tested & Keywords

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Practise the full RRB Staff Nurse Delhi-2015

Attempt every question from this paper in a timed mock, then review the full solution for each one.