[Elements vary by font: some fonts display the topmost horizontal stroke shorter than the central stroke] Before considering these elements, it must be emphasized that the glyph was created long prior to any modern religious concepts of heaven, during a time when the only religion was shamanism and the only gods were sex, and perhaps the Sun. Abū al-Qāsim Muḥammad ibn ʿAbd Allāh ibn ʿAbd al-Muṭṭalib ibn Hāshim had not yet been conceived, nor had Siddhārtha Gautama Buddha. This glyph was created thousands of years prior to the parthenogenetical immaculate conception that resulted in Jesus of Nazareth (but…wait a moment—no-fault viable zygote formation indeed was the norm of that era…). Consequently, do not expect that these elements correspond to anything resembling today's concepts of an eternal reward sitting at the foot of a throne, or any other new thought that has evolved during the past 3,000 years concerning heaven.
Original glyph that this one replaces used elements of either「dragging off a prepubescent girl」or「jerking emerging shafts」(䒶). In some modern fonts, appears to depict「array」and「big」as OUTER SPACE,「both hands spread exceptionally wide」while looking up at the SKY (praying to the gods in heaven, they say), or the HEAVENS at night…however,「horizontal motion with both hands」back and forth for one purpose or another is much more likely (as described by the original, related glyph 䒶). Traditional fonts depict these elements as a「downward thrusting penis taut, to one side and then the other side」suggestive of a sequence of penetrations as BEING IN THE CLOUDS (宇), HEAVENLY, AS GOOD AS IT GETS, FLOATING IN AIR, DIVINE, and so on.
Vocabulary meanings of DIPPING STIFF MEAT INTO SAUCE, and, DEEP-FRIED HOT AND BUBBLING, refer to the original elements as well, especially if you realize that tempura soba includes peeled shrimp coated with whitish batter and the curled but stiff shape of hot and firm meat inside. Allegedly a Portuguese word that was transliterated into Japanese, no one need guess why this particular glyph was selected to express the pronunciation てん from among 150 or so glyphs in the JIS list that have this same pronunciation…ever notice how the back of a peeled prawn resembles the underside of a schwantz?
Other meanings can easily be imagined from these elements. Early humans were more akin to bonobos than to God, and perhaps are still (blame dopamine, if you must blame).
Note that the glyph meaning「young, youth, to die young」that often refers to a divine service provider, or, to mentulomanaical selfie sessions (夭, repeatedly with two hands) is drawn exactly as is「heavenly」in some glyphs. Displayed in traditional Chinese fonts as「two male adults」not a subtle reference to the rampant homosexuality of both China and Japan in the past (with no commentary here related to the present).

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: day; sky; heaven
Japanese EDRDG: heavens, sky, imperial
Unihan extended: sky, heaven; god, celestial

Used within names (nanori)
あき　･　あも　･　た　･　たかし　･　て　･　なま