I read the following on the internet:
Notice there's a wide spectrum on the Samatha/Vipassana scale, but even on the extreme spectrum of Vipassana, the "dry-insight", there's still element of Samatha ( the khanika/Samadhi/Momentary Concentration, see Ven. Gunaratana's "The Jhanas" for more details ).
It is said the Buddhist commentaries refer to Khanika (momentary), Upacara (neighborhood) and Appana (attainment) Samadhi.
Are 'samatha' & 'samadhi' synonymous? Does Buddhism refer to Khanika/Momentary Samatha?