Panchanga Shudhi

The five limbs of the Panchanga are supposed to represent the five sources of ethereal energy of which some are visible and others invisible and which when properly secured are said to conduce the health, wealth and prosperity of mankind.
Panchanga consists of Tithi, Vara, Nakshatra, Yoga and Karana. All these must be auspicious to successful fructification of any event.

Days
The 4th, 6th, 8th, 12th and 14th, full and new moon days should be avoided.

Vara
Thursday and Friday are held to be suitable for all works. Tuesday, is to be generally avoided except when it happens to be the 10th, 12th or 16th day of the child's birth when the child's Namakarana (baptising or giving name) may be performed.


Nakshatra
Bharani and Krittika should be avoided for all auspicious works as these two are said to be presided over by the god of death (Yama) and the god of fire (Agni) respectively.
In urgent cases if the Lagna could be fortified, the dosha due to nakshatra may get neutralised.
The last parts of Aslesha, Jyeshta and Revati should also be avoided.

Yoga The 6th (Atiganda). 9th (Soola). 10th (Ganda), 17th (Vyatipata) and 27th (Vydhruti) have deleterious effects upon events which are started or commenced under them.

Karana
The Karana chosen must be appropriate to the election in view. Thus Bava is auspicious for starting works of permanent importance while Taitila is propitious for marriage. Bhadra(Vishti Karana) is unfit for any good work but is eminently suitable for violent and cruel deeds. For getting initiation into kshudra mantras Sakuni Havana is propitious.

Therefore, Panchanga Suddhi means a good lunar day, a beneficial weekday, an auspicious constellation, a good yoga and a fertilising Karana.

Panchanga shudhi ensures the favorable results of any event. The event will meet with success so long as the Panchanga components are favorable, the Panchanga lords are well-disposed, the Vara/Tithi/Nakshatra Yoga is favorable, on the other hand, the panchanga components and their lords are unfavorable.
If the Panchanga components had all been favorable, then these neutralizations of blemishes
"Panchanga Suddhi" means that Day, Nakshtra, Thithi, Yoga and Karana are all auspicious at a particular time

To calculate "Panchanga Shuddhi" Manually , there are Panchanga Shuddhi Chakaras (Tables)

1 Day/Nakshtra Table (only the Siddhi, Subha, and Amrita conditions are auspicious)  

Nakshtra	1	2	3	4	5	6	7
	Sunday	Mon	Tues	Wed	Thurs	Fri	Sat
Asvida	Sidhi	Ava	Amritha,	Mara	Shubha	Ava	Shubha
Berna	Dadgdha	Shubha	Ava	Kana	Shubha	Ava	Ava
Kethi	Ava	Shubha	Shubha	Siddhi	Yama	Shubha	Shubha
Rehana	Shubha	Shubha	Shubha	Subha	Uthpatha	Shubha	Shubha
Murgash.	Shubha	Siddhi	Ava	Amurtha	Mara	Shubha	Ava
Adha	Ava	Ava	Shubha	Ava	Kana	Shubha	Ava
Punar.	Shubha	Ava	Shubha	Shubha	Siddhi	Ava	Shubha
Pusha	Shubha	Shubha	Shubha	Shubha	Subha	Uthpatha	Shibha
Aslisa	Ava	Shubha	Sidhi	Ava	Amurtha	Mara	Shubha
Ma	Ava	Ava	Ava	Shubha	Ava	Kana	Shubha
Pu.	Shubha	Shubha	Ava	Shubha	Shubha	Siddhi	Ava
Ut.	Shubha	Shubha	Shubha	Shubha	Shubha	Shubha	Uthpatha
Hastha	Shubha	Ava	Shubha	Siddhi	Ava	Amurtha	Mara
Chitra	Shubha	Dagdha	Ava	Ava	Shubha	Ava	Kana
Sa	Ava	Shubha	Shubha	Ava	Shubha	Shubha	Siddhi
Visa	Uthpatha	Shubha	Shubha	Shubha	Shubha	Shubha	Shubha
Anura	Mara	Shubha	Ava	Shubha	Siddhi	Ava	Amurtha
Deta	Kana	Shubha	Ava	Ava	Ava	Shubha	Ava
Mula	Sidhi	Ava	Shubha	Shubha	Ava	Shubha	Shubha
Puva.	Shubha	Uthpatha	Shubha	Shubha	Shubha	Shubha	shubha
Utra	Amurtha	Mara	Shubha	Ava	Shubha	Siddhi	Ava
Suvana	Shubha	Sidhi	Ava	Shubha	Shubha	Ava	Shubha
Denata	Shubha	Subha	Uthpatha	Shubha	Shubha	Shubha	Shubha
Siyawas	Ava	Amurtha	Mara	Shubha	Ava	Shubha	Siddhi
Purvabad	Shubha	Ava	Kana	Shubha	Ava	Ava	Ava
UthraB.	Shubha	Shubha	Siddhi	Ava	Shubha	Shubha	Ava
Revathi	Shubha	Shubha	Shubha	uthpatha	Shubha	Ava	Shubha

Ex. If Ashwini Nakshtra Falls on a Sunday then it is called Siddhi which is Auspicious 
but if the same Nakshtra on a Monday is not good (Ava)

2. Day /Thithi Table (Here also Shubha, Amrit and Siddhi conditions are good others bad)

Thithi (Shukala/Krishna)		Sunday	Monday	Tu.	Wed.	Th..	Fri	Sat
1	Partipat	Amurtha	Shubha	Amrit	Sanvruthi	Shubha	Siddhi	Shubha
2	Davitya	Shubha	Amrit	Shubha	Visha	Shubha	Amrit	Shubha
3		Shubha	Shubha	Sidhi	Dagdha	Shubha	Shubha	Shubha
4		Visha	Riktha	Riktha	Riktha	Amrit	Riktha	Siddhi
5		Shubha	Shubha	Dagdha	Shubha	Siddhi	Shubha	Amrit
6		Amrit	Visha	Amrit	Gidra	Dagdha	Siddhi	Krakava
7		Samvruthi	Amrit	Visha	Sidhi	Shubha	Krakava	Visha
8		Shubha	Shubha	Siddhi	Agni	Visha	Dagdha	Shubha
9		Riktha	Riktha	Riktha	Krakava	Agni	Riktha	Dagdha
10		Shubha	Shubha	Krakava	Shubha	Siddhi	Agni	Agni
11		Amrit	Krakava	Amurtha	Shubha	Shubha	Siddhi	Agni
12		Agni	Amrit	Shubha	Siddhi	Shubha	Amrit	Shubha
13		Shubha	Shubha	Siddhi	Amrit	Shubha	Shubha	Shubha
14		Riktha	Riktha	Riktha	Riktha	Amrit	Riktha	Siddhi
15Full Moon Day (purnima)		shubha	Shubha	Shubha	Shubha	Siddhi	shubha	Amrit
16 Amavasya (No Moon)		Not Good	Not Good	Not Good	Not Good	Not Good	Not Good	Not Good

Ex. If Krishna or Shuka Thithi 1 (Partipat) falls on a Sunday then the condition is called Amrit (Good)


3. Yoga
Following are Bad yogas :
Vishkamba, Athiganda, Shula, Druma, Ganda, Viyagatha, Vajra Viyathipatha, Parogha, Vidruthi

4. Karana
Vishti , Shakuna, Chatuspada , Nagha, and Kistunga are Bad

DAGDHA THITHIS TO AVOID ACCORDING TO THE SUN'S POSITION IN CONSTELLATIONS

1. When Sun is in Mesha (Aries) avoid 6th Tithi (Dagdha) - Usually Sun is in Aries (Mesha) from 14th April to 14th May and in between there are 26th Tithis One is waxing and other is waining , even if the Panchanga Shuddhi occours , those are invalid as it was cancelled due to Sun's position.

Other Dhagdha Thithis,

15th May to 14th june (Vrushaba Sun) 4 th thithies

Mithuna Sun 8 th thithies
Simha Sun 10th
Thula Sun 12th thithies
Dhanu Sun 2nd
Kataka Sun- 6th
Kumbha Sun 4th
Kanya Sun 8th
Vrushika Sun 10th
Makara Sun 12th
Meena Sun 2nd