What if my 10th house is empty?

In Western astrology an empty house is still read, through the sign on its cusp and that sign's ruler. Empty doesn't mean "no career."

Does my Sun sign say anything about my career?

Some readings use it. It is the least specific option, since everyone born in about a month shares it.

Should I change jobs because of a transit?

No. Decide on the job itself. A transit can be a prompt to reflect, not a reason to act.

Do I need a birth time for a career reading?

For the Midheaven and 10th house, yes. Without it, you can still read most planet signs.

What does my birth chart say about my career?

In Western astrology, career is read mainly from the 10th house and the Midheaven, the top of the chart. Astrologers read them as themes about public role and ambition. No study has shown a chart can predict which job suits you, so use it to ask better questions about your work, not to choose it.

Where in the chart do astrologers look for career?

The main place is the 10th house, the section at the top of the chart. In Western astrology it is read as the area of work, reputation and public life. Kerykeion's guide says it "maps your relationship with vocation, public contribution, and the structures of authority." (Kerykeion)

The same guide reads it in three layers: "the sign on the Midheaven (MC) cusp, any planets placed within the house," and "the location of the Tenth House ruler in the rest of the chart." (Kerykeion)

Other places astrologers in the Western tradition may bring in:

The 6th house, read as daily work, routines and the conditions you work in.
The 2nd house, read as money and what you value.
Saturn, read as discipline, structure and long-term effort.

Vedic astrology has its own methods, including the 10th house from the ascendant and timing through dashas. This page sticks to the Western reading.

What is the Midheaven, and why does it need a birth time?

The Midheaven (MC) is the point of the zodiac that was crossing the north-south line through the sky above you at the moment and place you were born. In most house systems it marks the start of the 10th house. (Kerykeion)

Like the rising sign, it moves fast as the Earth turns. So it needs a reasonably accurate birth time. Without one, the Midheaven and the 10th house are unknown, and a career reading built on them is guesswork. You can still read Saturn and the other planets by sign.

Can my chart tell me what job to do?

No. Here the honest answer matters, because career choices are big.

Astrology readings sometimes link signs or placements to jobs, such as a Midheaven in a particular sign pointing to a particular field. Those links come from tradition. They are not established facts about ability or fit. In a controlled test published in Nature in 1985, astrologers could not match birth charts to people's personality profiles better than chance. (Carlson 1985, via Wikipedia) If a chart can't reliably describe personality, it can't reliably sort people into careers.

What decides a good career move is real: your skills, what you enjoy, the pay you need, the market and the people around you.

How can I use my chart for career reflection?

Treat the 10th house as a set of questions, not answers.

Read the tradition's description of your Midheaven sign and any planets in your 10th house.
Turn each line into a question. If it says "drawn to leadership," ask: "Do I actually want to lead? When did I last enjoy it?"
Check it against your record. What have you really done, liked and been good at? That evidence beats any description.
Write down what you decide and why, then look back later at how it turned out.

What does this look like for a real decision?

Lena has Capricorn on her Midheaven. In Western astrology that is read as a theme of structure, patience and long-term goals.

As an answer, that might say "pick a steady corporate path." As a question, it becomes: "Do I want slow, steady progress, or am I telling myself that because it sounds safe?" Lena writes her honest answer, decides to apply for a project-lead role, and notes the date. Three months later she reads back what she wrote and what actually happened. The chart started the question. Her own record answered it.

How does Mystogian help with career decisions?

Mystogian's readings come from an AI strategist that reads your chart against your own journal, goals and the decisions you log, and it can quote your past entries back to you with their dates. In the Decision Room you log a decision, and the app reminds you about it two weeks later and again three months later (if notifications are on) so you can record how it actually turned out.

FAQ

What if my 10th house is empty?: In Western astrology an empty house is still read, through the sign on its cusp and that sign's ruler. Empty doesn't mean "no career."
Does my Sun sign say anything about my career?: Some readings use it. It is the least specific option, since everyone born in about a month shares it.
Should I change jobs because of a transit?: No. Decide on the job itself. A transit can be a prompt to reflect, not a reason to act.
Do I need a birth time for a career reading?: For the Midheaven and 10th house, yes. Without it, you can still read most planet signs.

Sources

Kerykeion, "Natal Tenth House": https://kerykeion.net/content/learn-astrology/natal-tenth-house
Kerykeion, "The Tenth House" (foundations): https://kerykeion.net/content/learn-astrology/foundation-tenth-house
Carlson, S. (1985). "A double-blind test of astrology." Nature 318, 419-425, summarised at: https://en.wikipedia.org/wiki/Shawn_Carlson