Planets make aspects. Aspects are specific distances with other planets or angles in the chart. The major aspects are conjunction 0d) sextile (60d), square (90d) trine (120d) and opposition (180d). An aspect needs not to be exactly the mentioned distance. There is an orb. I use a 5 degree orb (with exceptions). A calling planet doesn't make such an aspect within orb or sign. (I don't say that there is no aspect when there is an aspect within 5 degrees orb, but out of sign. I just use these indications for 'calling planets').
Calling planets tend to present their energy at any kind of level, somehow, anyhow.
When it is your Sun that doesn't make major aspects within 5 degrees orb and/or in sign you will draw attention, somehow, anyhow as a leader, performing, showing off, whatever it takes.
Here is the quote from my site Astromarkt:
Sun without aspects: leadership, show, performance (as an athlete, for example), drawing attention at any possible level
Moon without aspects attrackts children. Everything related to children (education, care) will be highlighted. The Moon is of importance for memorising, like in history and when you play a certain role on stage, but also for cooks.
Mercury = seeking for contacts and ways for communication as a writer, reporter, or transporter (delivering messages).
Venus = seeking for love, kindness and sympathy. Style, beauty, charm and diplomacy will be used in the profession, if possible. Venus is important in the charts of diplomats, stylists, beauties and those working in the field of entertainment and pleasure.
Mars without aspects will be strongly dedicated to the job, often in sports, in the military, industry or as an entrepeneur. If Mars is not working, the energy will find a way out in adventures, activism or by showing very high and very low levels of energy and drive.
Jupiter = seeking for a conviction or religion and wants development. An unaspected Jupiter will be an international, a traveller, someone with a strong conviction, showing the way (sometimes as a coach, sometimes on a trip).
Saturn = seeking for stability and security, status. Of course an unaspected Saturn will be found in the charts of those who work in the government, construction, with the elderly or in any hierarchy.
Uranus = seeking for sensation, new items and news. That is why the unaspected Uranus will likely be driven to gadgets, the latest findings, technology, inventions and ...news. Journalists, inventors, engineers, computer freaks and technocrats are among those with an unaspected Uranus. Sometimes it is the signature of the outsider or rebel.
Neptune = seeking mystic, romance, rest. All that you can't touch or feel, but smell sometimes is Neptunic, like the perfume industry and chemistry. Drugs, the movies, religion, spirtiuals and spirituality are part of the world of Neptune.
Pluto = seeking challenges and influence by using force and authority or values (money). Strong men (with or without muscles) have unaspected Pluto's, but Pluto is also 'calling' those who work in cases of life and death, and where strategy is needed (in politics, for example).
A CALL FOR...
Those planets, Sun or Moon strongly influence your career, because they manifest themselves at any possible level, somehow or anyhow and strongly drive you into a certain direction.
And of course, you can have more than one 'calling planet' or an MC without major aspects (so that your position can reach any level) or a dito Ascendant (a presentation at any level).
That is the theory. There are examples on this blog. The latest is Betty Ford, who had the Sun without major aspects and who became the nation's First Lady.
Also visit: Astromarkt.net