Concept Map โ€” Chapter 11

Last updated at June 17, 2026 by

๐Ÿ’ก Tip: follow the blue spine from "Keeping Time with the Skies" down to each topic. On a phone the map stacks top to bottom.
Keeping Time with the Skies Sky cycles measure time 11.1 Moon's Appearance Phases 11.2 Calendars Days, months, years 11.3 Festivals Linked to the sky 11.4 Satellites Natural & artificial Phases Waxing & waning Lit half seen Changes our view Lunar & solar Moon vs seasons Luni-solar Extra month added Festival dates Moon or Sun based Uses Communication, maps Space debris Must be managed
Keeping Time with the Skies
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11.1 Moon's Appearance
Why phases happen
Phases
Waxing and waning
Lit half seen
Our view changes
11.2 Calendars
Days, months, years
Lunar & solar
Moon vs seasons
Luni-solar
Extra month added
11.3 Festivals
Linked to the sky
Festival dates
Moon or Sun based
11.4 Satellites
Natural and artificial
Uses
Communication, maps
Space debris
Must be managed
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CA Maninder Singh

CA Maninder Singh is a Chartered Accountant with 16+ years of practical experience and 20+ years of teaching experience. At Teachoo, he simplifies Accounts, Tax and GST with step-by-step examples so students can apply concepts confidently in exams and real life.

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