Linked from

The 12 pages that link to Leap second, each with the reason it gives.

• Leap yearCompared with: It is often confused with a leap day but corrects a different timekeeping mismatch.

• Coordinated Universal TimeBroader topic: This adjustment keeps UTC close to time measured by Earth’s rotation.

• Greenwich Mean TimeRelated: Leap seconds reconcile atomic time with the rotation-based reference once associated with GMT.

• HourCompared with: It shows how clock time can be adjusted against astronomical time without changing the hour unit.

• Universal TimeRelated: The difference between atomic time and UT1 determines when this adjustment is needed.

• Unix timeRelated: Unix time excludes leap seconds, so it does not count every UTC second uniformly.

• Network Time ProtocolRelated: Leap-second handling can make synchronized clocks behave differently at UTC adjustments.

• International Atomic TimeRelated: Leap seconds change UTC’s offset from continuous TAI without interrupting TAI.

• DayRelated: It compensates for the mismatch between uniform atomic time and the variable solar day.

• MidnightRelated: It can alter the seconds surrounding midnight in UTC-based clocks.

• Day (time unit)Broader topic: It corrects accumulated divergence between atomic time and solar time.

• Real-time clockRelated: Its irregular insertion makes a simple hardware calendar clock imperfect as a UTC source.