The Indian National Calendar (11.2.4) — "Keeping Time with the Skies"

1. 13 marks

   Is the Indian National Calendar lunar, solar, or luni-solar? Describe its key structural features.

   Hint. The chapter states its type directly, then gives its year length, start date and month-length pattern.

   ✦ It is a solar calendar, consisting of 365 days in a year. The year begins on 22 March (the day after the spring equinox). Unlike the Gregorian calendar, months have either 30 or 31 days — in a regular year, the second to sixth months have 31 days and the rest have 30 — since month names were taken from traditional Indian calendars.

2. 22 marks

   How does the Indian National Calendar's leap year stay synchronised with the Gregorian calendar's leap year?

   Hint. The correction is added to a specific, named month at the very start of the year.

   ✦ In leap years, an extra day is added to Chaitra, the first month of the Indian National Calendar year — and in such years, the new year begins on 21 March of the Gregorian calendar instead of 22 March, which is why the two calendars' leap-year timing stays matched.

3. 33 marks

   Ever heard of... what was the Calendar Reform Committee, and what did it lead to?

   Hint. Set up by the Government of India in a specific year, chaired by a named scientist.

   ✦ In 1952, the Government of India set up a Calendar Reform Committee (CRC) to examine all calendars then in use across the country and recommend one accurate, uniform calendar for all of India. Its recommended 'Unified National Calendar' was adopted from 21 March 1956 CE (1 Chaitra 1878 Saka), since the Indian National Calendar follows the general principles of the Surya Siddhanta.

4. 43 marks

   Be a scientist: who was Meghnad Saha, and what two separate things is he known for in this chapter's context?

   Hint. One contribution is astrophysics research; the other is a leadership role connected directly to this chapter's topic.

   ✦ Meghnad Saha (1893–1956) was a pioneering Indian astrophysicist who studied stars and their temperatures and developed the Saha equation — the Saha Institute of Nuclear Physics, Kolkata, is named after him. Separately, and directly relevant to this chapter, he was also the chairperson of the Calendar Reform Committee, which is why the Indian National Calendar carries his committee's stamp.

Solutions written by the tuition.in editorial team and checked against NCERT Curiosity — Textbook of Science for Grade 8, Chapter 11 (hecu111.pdf), Reprint 2026-27, pages 170-189. Questions are referenced from the NCERT textbook for identification.