The pentagram (pentacle or pentalpha) is considered by some western occultists to trace its esoteric significance to an astronomical observance of the pattern of Venus' conjunctions with the Sun. This is not possible.
A superior conjunction occurs when Venus is behind the Sun and the inferior conjunction is when Venus is between Earth and the Sun; in both cases Venus is not visible. But it is true that plotting the recurrence of Venus' westward elongation from the Sun, over five consecutive synodic periods, will create the points of a pentagram. This period is approximately 584 days long, each period determining a different point of the observed pentagram—taking approximately eight years, five days to complete the figure. One would get a pentagram by picking any sunrise date on which the morning star is prominent and then repeating the observation at 584 day intervals following that date.
The synodic period of Venus, the time required for it to return to the same position relative to the Sun as seen by an observer on Earth, is 583.9211 days. There is a 0.0789 day slippage every 584 days, totalling a one day slippage each 12.67 synodic periods. This means that the pentagram figure is slowly revolving within an oval in a clockwise direction, alternating either one or two points ascendant roughly every 160 years. There is no observation point on Earth that would present a regular pentagram. Moving further north elongates the figure while on the equator the figure is an irregular pentagon. ¹
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2 Peter 1:19 (KJV)
We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and [the day star]² arise in your hearts:
2 Peter 1:19 (GNT)
και ἔχομεν βεβαιοτερον τον προφητικον λογον, ὧ καλως ποιειτε προσεχοντες ως λυχνω φαινοντι εν αυχμηρω τοπω ἕως οὗ ημερα διαυγαση και [φωσφορος]² ανατειλη εν ταις καρδιαις υμων·
2 Peter 1:19 (Vulgate)
et habemus firmiorem propheticum sermonem cui bene facitis adtendentes quasi lucernae lucenti in caliginoso loco donec dies inlucescat et [lucifer]² oriatur in cordibus vestris
2 Peter 1:19 New Living Translation (NLT).
19 Because of that experience, we have even greater … in the message proclaimed by the prophets. You must pay close attention to what they wrote, for their words are like a lamp shining in a dark place—until the Day dawns, and [Christ the Morning Star]²* shines in your hearts.
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¹ http://freemasonry.bcy.ca/anti-masonry/venus.html
² Strong's G5459²* φωσφορος phosphoros foce-for'-os From G5457 and G5342; light bearing (“phosphorus”), that is, (specifically) the morning star (figuratively): - day star.
²* Thayer G5459² φωσφορος phosphoros (1) light bringing, giving light (2) the planet Venus, the morning star, day star (3) metaphorically Christ