In this manner are the results to be explained which appear when a forcibly bent stem is so placed that the plane of the curve is horizontal. Under these conditions it appears that the action of gravitation predominates, since only the zenithward side underwent thickening of the cell walls.
Source: wiktionary
It was starlight and I explained the Signs of the Zodiac to her, and pointed out Mars, a bright dot of light creeping zenithward, towards which so many telescopes were pointed.
Source: wiktionary
Nineteen eighty-six was officially declared the “Year of Peace—Security without War,” by order of General of Forces Manuel Noriega. All over Panama, signs with that slogan blossomed, often embossed with a ring of five stars, the general’s insignia, and little white doves flapping bravely zenithward.
Source: wiktionary
Dixon having drifted into a hypnagogic passage in which, amid a profligacy of stars rushing by, he is traversing straight upward, Zenithward— "Eeh! Eeh!"
Source: wiktionary