A Zenith Experience is any positively felt Connection Experience. A zenith experience may range in power from minor nature and peak experiences through to full blown visionary revelation.
Zenith experiences are pleasant moments of unity, oneness, peace, bliss, enlightenment, realization, etc., caused when Consciousness descends into a Physical Unit that is healthy, prepared, and embedded in a supportive milieu (Sosteric, SA1).
A zenith experience may occur spontaneously as is the case, for example, when somebody is walking through the forest and they suddenly experience feelings of unity or oneness), or it can be induced, as for example when the Bodily Ego is intentionally suppressed through meditational practices (e.g. Transcendental Meditation) or nutritional supplementation (i.e. ingestion of Connection Supplements.)
A Zenith experience is the opposite of a Nadir Experience.
Zenith experiences may be distinguished along a continuum of duration and intensity. The following is a tentative ordering from least to most intense.
Sosteric, Mike. (RSGAS). The Rocket Scientists' Guide to Authentic Spirituality. St. Albert, Alberta: Lightning Path Press. 
Sosteric, Mike. (SOA). The Science of Ascension: A Neurologically Grounded, Spiritually Sophisticated Theory of Mystical/Spiritual Experience. Unpublished. 
Sharp, Michael (BOOK2). Lightning Path Workbook Two: Introduction to the Lightning Path. Lightning Path Press.